fix(fonts): FONT_NAME_MAP改为Noto Sans SC适配容器实际字体

容器内 NotoSansCJK ttc 已被移除，仅剩 NotoSansSC-VF.ttf，
注册名为 'Noto Sans SC'。fc-match 'Noto Sans CJK SC' 会回退到
DejaVu Sans 导致中文渲染异常。

- ass_subtitle_builder: 思源黑体/苹方/PingFang/微软雅黑/华康俪金黑
  全部映射为 'Noto Sans SC'
- title_overlay: _FONT_CANDIDATES 优先查找 NotoSansSC-VF.ttf
- 同步更新相关单测断言

packages/domain/ass_subtitle_builder.py

@@ -26,13 +26,13 @@ TITLE_MARGIN_SIDE = 40
 
 # 字体名称映射：前端中文字体名 → 服务器实际注册名（ffmpeg/ASS 通过注册名匹配字体）
 FONT_NAME_MAP: dict[str, str] = {
-    "思源黑体": "Noto Sans CJK SC",
+    "思源黑体": "Noto Sans SC",
     "思源宋体": "Noto Serif CJK SC",
-    "苹方": "Noto Sans CJK SC",
-    "PingFang": "Noto Sans CJK SC",
-    "微软雅黑": "Noto Sans CJK SC",
+    "苹方": "Noto Sans SC",
+    "PingFang": "Noto Sans SC",
+    "微软雅黑": "Noto Sans SC",
     "楷体": "Noto Serif CJK SC",
-    "华康俪金黑": "Noto Sans CJK SC",
+    "华康俪金黑": "Noto Sans SC",
 }
 
 
@@ -191,7 +191,6 @@ def format_ass_time(seconds: float) -> str:
 # ── 完整 ASS 内容生成 ─────────────────────────────────────────────────────────
 
 
-
 def _wrap_title_text(
     text: str,
     video_width: int,
@@ -282,20 +281,28 @@ def build_ass_content(
     if title_config:
         _stroke_val = title_config.get("stroke")
         if isinstance(_stroke_val, bool):
-            title_config["stroke"] = {
-                "enabled": _stroke_val,
-                "color": "#000000",
-                "width": 2,
-            } if _stroke_val else {"enabled": False}
+            title_config["stroke"] = (
+                {
+                    "enabled": _stroke_val,
+                    "color": "#000000",
+                    "width": 2,
+                }
+                if _stroke_val
+                else {"enabled": False}
+            )
         _shadow_val = title_config.get("shadow")
         if isinstance(_shadow_val, bool):
-            title_config["shadow"] = {
-                "enabled": _shadow_val,
-                "color": "#000000",
-                "blur": 4,
-                "offset_x": 2,
-                "offset_y": 2,
-            } if _shadow_val else {"enabled": False}
+            title_config["shadow"] = (
+                {
+                    "enabled": _shadow_val,
+                    "color": "#000000",
+                    "blur": 4,
+                    "offset_x": 2,
+                    "offset_y": 2,
+                }
+                if _shadow_val
+                else {"enabled": False}
+            )
 
     title_enabled = title_config.get("enabled", True) and bool(title_text.strip())
     subtitle_enabled = subtitle_config.get("enabled", True) and bool(subtitle_text.strip())

packages/shared/title_overlay.py

@@ -15,6 +15,7 @@ logger = logging.getLogger(__name__)
 
 # 按优先级查找 CJK 字体（Debian/Ubuntu fonts-noto-cjk 安装路径）
 _FONT_CANDIDATES = (
+    "/usr/share/fonts/opentype/noto/NotoSansSC-VF.ttf",
     "/usr/share/fonts/opentype/noto/NotoSansCJK-Bold.ttc",
     "/usr/share/fonts/opentype/noto/NotoSansCJK-Regular.ttc",
     "/usr/share/fonts/truetype/noto/NotoSansCJK-Bold.ttc",

tests/unit/test_ass_subtitle_builder.py

@@ -79,7 +79,7 @@ class TestBuildAssStyle:
     def test_minimal_style(self):
         result = build_ass_style("TestStyle")
         assert result.startswith("Style: TestStyle,")
-        assert "Noto Sans CJK SC" in result
+        assert "Noto Sans SC" in result
         assert ",48," in result
 
     def test_custom_font_size(self):
@@ -152,21 +152,20 @@ class TestBuildAssStyle:
         # Style: 行有 23 个字段（去掉 "Style: " 前缀后）
         assert len(parts) == 23
 
-
     def test_font_name_mapping_siyuan(self):
-        """思源黑体 → Noto Sans CJK SC"""
+        """思源黑体 → Noto Sans SC"""
         result = build_ass_style("Test", font_name="思源黑体")
-        assert "Noto Sans CJK SC" in result
+        assert "Noto Sans SC" in result
 
     def test_font_name_mapping_apple(self):
-        """苹方 → Noto Sans CJK SC"""
+        """苹方 → Noto Sans SC"""
         result = build_ass_style("Test", font_name="苹方")
-        assert "Noto Sans CJK SC" in result
+        assert "Noto Sans SC" in result
 
     def test_font_name_mapping_msyh(self):
-        """微软雅黑 → Noto Sans CJK SC"""
+        """微软雅黑 → Noto Sans SC"""
         result = build_ass_style("Test", font_name="微软雅黑")
-        assert "Noto Sans CJK SC" in result
+        assert "Noto Sans SC" in result
 
     def test_font_name_mapping_unknown_passthrough(self):
         """未映射字体原样使用"""
@@ -174,7 +173,6 @@ class TestBuildAssStyle:
         assert "CustomFont" in result
 
 
-
 # ── 文本转义 ──────────────────────────────────────────────────────────────────
 
 
@@ -483,6 +481,7 @@ class TestConstants:
     def test_title_margin_side(self):
         assert TITLE_MARGIN_SIDE == 40
 
+
 # ── 标题自动换行 ──────────────────────────────────────────────────────────────
 
 
@@ -554,7 +553,6 @@ class TestWrapTitleText:
         assert result == text
         assert result.count("\\N") == 2
 
-
     def test_build_ass_content_integration(self):
         """集成测试：build_ass_content 中的标题应该自动换行。"""
         long_title = "这是一段非常长的标题文字用于测试自动换行功能是否正常工作"

tests/unit/test_render_subtitles.py

@@ -80,7 +80,7 @@ class TestBuildAssStyle:
     def test_basic_style(self):
         style = _build_ass_style("Default")
         assert style.startswith("Style: Default,")
-        assert "Noto Sans CJK SC" in style
+        assert "Noto Sans SC" in style
         assert "48" in style  # font_size
 
     def test_custom_font(self):

tests/unit/test_render_subtitles_pure.py

@@ -84,7 +84,7 @@ class TestBuildAssStyle:
         """基本样式行包含关键字段."""
         line = _build_ass_style("Default")
         assert line.startswith("Style: Default,")
-        assert "Noto Sans CJK SC" in line
+        assert "Noto Sans SC" in line
         assert "48" in line  # font_size
 
     def test_bold_enabled(self):

tests/unit/test_title_render_consistency.py

@@ -230,7 +230,7 @@ class TestFullStyleConsistency:
         fields = [f.strip() for f in style_line.split(",")]
 
         # Fontname
-        assert fields[1] == "Noto Sans CJK SC"
+        assert fields[1] == "Noto Sans SC"
         # Fontsize = 28
         assert fields[2] == "28"
         # Bold = -1 (True)