fix(#1754): ASS 标题位置常量同步前端改动（TOP 120→180, BOTTOM 60→100） (#1756)

Co-authored-by: xiaoxia <dev@xiaoxiajianji.com>
Co-committed-by: xiaoxia <dev@xiaoxiajianji.com>

packages/domain/ass_subtitle_builder.py

@@ -20,8 +20,8 @@ logger = logging.getLogger(__name__)
 # ── 常量 ──────────────────────────────────────────────────────────────────────
 
 # Title/Subtitle 默认边距（像素）
-TITLE_MARGIN_TOP = 120
-TITLE_MARGIN_BOTTOM = 60
+TITLE_MARGIN_TOP = 180
+TITLE_MARGIN_BOTTOM = 100
 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）

tests/unit/test_ass_subtitle_builder.py

@@ -473,10 +473,10 @@ class TestBuildAssContent:
 
 class TestConstants:
     def test_title_margin_top(self):
-        assert TITLE_MARGIN_TOP == 120
+        assert TITLE_MARGIN_TOP == 180
 
     def test_title_margin_bottom(self):
-        assert TITLE_MARGIN_BOTTOM == 60
+        assert TITLE_MARGIN_BOTTOM == 100
 
     def test_title_margin_side(self):
         assert TITLE_MARGIN_SIDE == 40