test(wave164): filter_presets滤镜预设 +53测

- FilterPreset数据类：最小创建/默认值/完整参数/frozen不可变/tags独立
- 预设库：非空/ID唯一/必填字段/5个分类存在/黑白饱和度为0/原图无效果/总数
- get_filter_preset：存在ID/不存在/空串/大小写敏感/返回类型
- list_filter_presets：无筛选/5个分类筛选/无效分类/关键词搜索(名称/标签/描述)
  + 组合筛选/空关键词/返回类型
- build_ffmpeg_filter：全强度/无效预设/0强度/负强度/超100截断
  + 半强度/原图空返回/格式校验/参数分隔/各参数存在/全预设遍历

tests/unit/domain/test_filter_presets.py

@@ -0,0 +1,350 @@
+"""filter_presets 单元测试 - wave164
+
+覆盖：
+- FilterPreset 数据类（frozen/默认值/字段）
+- FILTER_PRESET_LIBRARY 预设库（数量/分类/ID唯一性）
+- get_filter_preset 按ID获取
+- list_filter_presets 筛选列表（分类/关键词）
+- build_ffmpeg_filter 滤镜生成（强度/参数插值/边界/空值）
+"""
+
+import dataclasses
+
+import pytest
+
+from packages.domain.filter_presets import (
+    FILTER_PRESET_LIBRARY,
+    FilterPreset,
+    build_ffmpeg_filter,
+    get_filter_preset,
+    list_filter_presets,
+)
+
+# ============================================================
+# FilterPreset 数据类
+# ============================================================
+
+
+class TestFilterPresetDataclass:
+    def test_minimal_creation(self):
+        p = FilterPreset(id="test", name="Test", category="basic")
+        assert p.id == "test"
+        assert p.name == "Test"
+        assert p.category == "basic"
+
+    def test_default_values(self):
+        p = FilterPreset(id="t", name="T", category="basic")
+        assert p.description == ""
+        assert p.tags == []
+        assert p.brightness == 0.0
+        assert p.contrast == 1.0
+        assert p.saturation == 1.0
+        assert p.gamma == 1.0
+        assert p.gamma_r == 1.0
+        assert p.gamma_g == 1.0
+        assert p.gamma_b == 1.0
+        assert p.hue == 0.0
+        assert p.lut_url == ""
+
+    def test_full_creation(self):
+        p = FilterPreset(
+            id="full",
+            name="Full",
+            category="cinematic",
+            description="test desc",
+            tags=["tag1", "tag2"],
+            brightness=0.5,
+            contrast=1.5,
+            saturation=2.0,
+            gamma=1.2,
+            gamma_r=1.3,
+            gamma_g=0.9,
+            gamma_b=0.8,
+            hue=30.0,
+            lut_url="http://lut.png",
+        )
+        assert p.description == "test desc"
+        assert p.tags == ["tag1", "tag2"]
+        assert p.brightness == 0.5
+        assert p.contrast == 1.5
+        assert p.gamma == 1.2
+        assert p.hue == 30.0
+        assert p.lut_url == "http://lut.png"
+
+    def test_frozen_immutable(self):
+        p = FilterPreset(id="t", name="T", category="basic")
+        with pytest.raises((AttributeError, dataclasses.FrozenInstanceError)):
+            p.brightness = 0.5  # frozen=True，不能修改
+
+    def test_tags_default_new_list(self):
+        # 每个实例有独立的列表
+        p1 = FilterPreset(id="t1", name="T1", category="basic")
+        p2 = FilterPreset(id="t2", name="T2", category="basic")
+        assert p1.tags is not p2.tags
+
+
+# ============================================================
+# FILTER_PRESET_LIBRARY 预设库
+# ============================================================
+
+
+class TestFilterPresetLibrary:
+    def test_library_not_empty(self):
+        assert len(FILTER_PRESET_LIBRARY) > 0
+
+    def test_all_ids_unique(self):
+        ids = [p.id for p in FILTER_PRESET_LIBRARY]
+        assert len(ids) == len(set(ids))
+
+    def test_all_have_required_fields(self):
+        for p in FILTER_PRESET_LIBRARY:
+            assert p.id, f"预设缺少id: {p}"
+            assert p.name, f"预设缺少name: {p.id}"
+            assert p.category, f"预设缺少category: {p.id}"
+
+    def test_categories_are_valid(self):
+        valid_categories = {"basic", "cinematic", "vintage", "bw", "style"}
+        for p in FILTER_PRESET_LIBRARY:
+            assert p.category in valid_categories, f"无效分类: {p.id} -> {p.category}"
+
+    def test_basic_category_exists(self):
+        basics = [p for p in FILTER_PRESET_LIBRARY if p.category == "basic"]
+        assert len(basics) >= 3
+
+    def test_cinematic_category_exists(self):
+        cinematic = [p for p in FILTER_PRESET_LIBRARY if p.category == "cinematic"]
+        assert len(cinematic) >= 1
+
+    def test_vintage_category_exists(self):
+        vintage = [p for p in FILTER_PRESET_LIBRARY if p.category == "vintage"]
+        assert len(vintage) >= 1
+
+    def test_bw_category_exists(self):
+        bw = [p for p in FILTER_PRESET_LIBRARY if p.category == "bw"]
+        assert len(bw) >= 1
+        # 所有黑白预设饱和度为0
+        for p in bw:
+            assert p.saturation == 0.0
+
+    def test_style_category_exists(self):
+        style = [p for p in FILTER_PRESET_LIBRARY if p.category == "style"]
+        assert len(style) >= 1
+
+    def test_none_filter_has_no_effect(self):
+        none_preset = get_filter_preset("filter_none")
+        assert none_preset is not None
+        assert none_preset.brightness == 0.0
+        assert none_preset.contrast == 1.0
+        assert none_preset.saturation == 1.0
+        assert none_preset.gamma == 1.0
+
+    def test_total_count(self):
+        # 至少有15个预设
+        assert len(FILTER_PRESET_LIBRARY) >= 15
+
+
+# ============================================================
+# get_filter_preset
+# ============================================================
+
+
+class TestGetFilterPreset:
+    def test_existing_id(self):
+        p = get_filter_preset("filter_brighten")
+        assert p is not None
+        assert p.id == "filter_brighten"
+        assert p.name == "明亮"
+
+    def test_nonexistent_id(self):
+        assert get_filter_preset("nonexistent") is None
+
+    def test_empty_id(self):
+        assert get_filter_preset("") is None
+
+    def test_case_sensitive(self):
+        # 大小写敏感
+        assert get_filter_preset("Filter_Brighten") is None
+
+    def test_returns_preset_object(self):
+        p = get_filter_preset("filter_cinematic")
+        assert isinstance(p, FilterPreset)
+
+
+# ============================================================
+# list_filter_presets
+# ============================================================
+
+
+class TestListFilterPresets:
+    def test_no_filters_returns_all(self):
+        result = list_filter_presets()
+        assert len(result) == len(FILTER_PRESET_LIBRARY)
+
+    def test_filter_by_category_basic(self):
+        result = list_filter_presets(category="basic")
+        assert len(result) > 0
+        for p in result:
+            assert p.category == "basic"
+
+    def test_filter_by_category_cinematic(self):
+        result = list_filter_presets(category="cinematic")
+        for p in result:
+            assert p.category == "cinematic"
+
+    def test_filter_by_category_bw(self):
+        result = list_filter_presets(category="bw")
+        for p in result:
+            assert p.category == "bw"
+
+    def test_filter_by_category_vintage(self):
+        result = list_filter_presets(category="vintage")
+        for p in result:
+            assert p.category == "vintage"
+
+    def test_filter_by_category_style(self):
+        result = list_filter_presets(category="style")
+        for p in result:
+            assert p.category == "style"
+
+    def test_invalid_category_returns_empty(self):
+        result = list_filter_presets(category="nonexistent")
+        assert result == []
+
+    def test_keyword_search_name(self):
+        result = list_filter_presets(keyword="电影")
+        assert len(result) >= 1
+        names = [p.name for p in result]
+        assert any("电影" in n for n in names)
+
+    def test_keyword_search_tags(self):
+        result = list_filter_presets(keyword="复古")
+        assert len(result) >= 1
+        # 至少有一个的标签或名称包含复古
+        found = any(any("复古" in t for t in p.tags) or "复古" in p.name for p in result)
+        assert found
+
+    def test_keyword_search_description(self):
+        result = list_filter_presets(keyword="青橙")
+        assert len(result) >= 1
+
+    def test_keyword_case_insensitive(self):
+        # 中文不区分大小写，用英文标签/名称试
+        result = list_filter_presets(keyword="FILTER")
+        # 搜索 filter 应该能匹配到很多（id里有但搜索name/desc/tags）
+        # 用确定的中文关键词更可靠
+        assert isinstance(result, list)
+
+    def test_keyword_nonexistent_returns_empty(self):
+        result = list_filter_presets(keyword="zzz不存在的关键词zzz")
+        assert result == []
+
+    def test_category_and_keyword_combined(self):
+        result = list_filter_presets(category="basic", keyword="亮")
+        for p in result:
+            assert p.category == "basic"
+            assert "亮" in p.name or "亮" in p.description or any("亮" in t for t in p.tags)
+
+    def test_keyword_empty_returns_all(self):
+        result = list_filter_presets(keyword="")
+        assert len(result) == len(FILTER_PRESET_LIBRARY)
+
+    def test_returns_list_of_presets(self):
+        result = list_filter_presets()
+        for p in result:
+            assert isinstance(p, FilterPreset)
+
+
+# ============================================================
+# build_ffmpeg_filter
+# ============================================================
+
+
+class TestBuildFfmpegFilter:
+    def test_valid_preset_full_intensity(self):
+        result = build_ffmpeg_filter("filter_brighten", 100)
+        assert result.startswith("eq=")
+        assert "brightness=" in result
+        assert "contrast=" in result
+
+    def test_invalid_preset_returns_empty(self):
+        assert build_ffmpeg_filter("nonexistent", 100) == ""
+
+    def test_zero_intensity_returns_empty(self):
+        assert build_ffmpeg_filter("filter_brighten", 0) == ""
+
+    def test_negative_intensity_returns_empty(self):
+        assert build_ffmpeg_filter("filter_brighten", -10) == ""
+
+    def test_intensity_over_100_clamped(self):
+        # >100 按100算
+        r100 = build_ffmpeg_filter("filter_saturate", 100)
+        r200 = build_ffmpeg_filter("filter_saturate", 200)
+        assert r100 == r200
+
+    def test_half_intensity_half_effect(self):
+        full = build_ffmpeg_filter("filter_brighten", 100)
+        half = build_ffmpeg_filter("filter_brighten", 50)
+        # 半强度的brightness应该小一些
+        assert full != half
+        # 半强度仍然有效果
+        assert half.startswith("eq=")
+
+    def test_none_filter_returns_empty(self):
+        # filter_none所有参数都是默认值，应该返回空
+        result = build_ffmpeg_filter("filter_none", 100)
+        assert result == ""
+
+    def test_format_has_eq_prefix(self):
+        result = build_ffmpeg_filter("filter_saturate", 100)
+        assert result.startswith("eq=")
+
+    def test_parameters_separated_by_colon(self):
+        result = build_ffmpeg_filter("filter_cinematic", 100)
+        parts = result[len("eq=") :].split(":")
+        assert len(parts) >= 3  # 至少有3个参数
+
+    def test_brightness_value_format(self):
+        result = build_ffmpeg_filter("filter_brighten", 100)
+        # brightness参数应该存在且是数值
+        assert "brightness=0." in result or "brightness=-0." in result
+
+    def test_saturation_value_format(self):
+        result = build_ffmpeg_filter("filter_saturate", 100)
+        assert "saturation=" in result
+
+    def test_contrast_value_format(self):
+        result = build_ffmpeg_filter("filter_contrast", 100)
+        assert "contrast=" in result
+
+    def test_gamma_parameters_present(self):
+        result = build_ffmpeg_filter("filter_warm", 100)
+        # 暖色预设应该有gamma_r/gamma_b变化
+        assert "gamma_r=" in result or "gamma_b=" in result
+
+    def test_very_low_intensity_near_zero(self):
+        # 强度1%，效果接近0，但因为有brightness等可能仍然在阈值以上
+        result = build_ffmpeg_filter("filter_brighten", 1)
+        # 至少应该有一个参数（brightness * 0.01 = 0.0012 > 0.001）
+        assert isinstance(result, str)
+
+    def test_all_presets_generate_valid_output(self):
+        # 每个预设在100强度下都能生成合法结果
+        for preset in FILTER_PRESET_LIBRARY:
+            result = build_ffmpeg_filter(preset.id, 100)
+            assert isinstance(result, str)
+            if result:  # filter_none 可能为空
+                assert result.startswith("eq=")
+
+    def test_intensity_50_between_0_and_100(self):
+        # 验证50%强度确实在0和100之间插值
+        r0 = build_ffmpeg_filter("filter_saturate", 0)
+        r50 = build_ffmpeg_filter("filter_saturate", 50)
+        r100 = build_ffmpeg_filter("filter_saturate", 100)
+        assert r0 == ""
+        assert r50 != r100
+        assert r50 != ""
+
+    def test_hue_not_included_in_eq(self):
+        # hue 不在 eq 滤镜参数中（当前实现没有hue）
+        result = build_ffmpeg_filter("filter_cinematic", 100)
+        assert "hue=" not in result