feat: flat design Sunset Glitch + download manager + settings + recommendations overhaul

- Sunset Glitch color palette applied to all templates
- Font Awesome icons throughout UI
- Download manager with parallel queue and progress tracking
- Settings page with dynamic configuration
- Recommendations router enhanced with scoring
- Local vendor libs (Alpine.js, HTMX) for offline support
- Auto test suite with screenshots
- Series releases list component
- New download model

app/models/settings.py

@@ -27,6 +27,13 @@ class AppSettingsBase(SQLModel):
 
     # #12: Custom download directory
     download_dir: str = Field(default="downloads")
+
+    # #13: Content weight mode ("auto" = based on download habits, "manual" = user-defined)
+    content_weight_mode: str = Field(default="auto", sa_column=Column(String))
+
+    # #14: Manual content weights (used when content_weight_mode = "manual")
+    content_weight_anime: int = Field(default=2)
+    content_weight_series: int = Field(default=1)
     
     @property
     def disabled_providers(self) -> List[str]:
@@ -64,6 +71,9 @@ class AppSettings(BaseModel):
     anime_enabled: bool = True
     series_enabled: bool = True
     download_dir: str = "downloads"
+    content_weight_mode: str = "auto"
+    content_weight_anime: int = 2
+    content_weight_series: int = 1
     
     class Config:
         from_attributes = True
@@ -79,3 +89,6 @@ class AppSettingsUpdate(BaseModel):
     anime_enabled: Optional[bool] = None
     series_enabled: Optional[bool] = None
     download_dir: Optional[str] = None
+    content_weight_mode: Optional[str] = None
+    content_weight_anime: Optional[int] = None
+    content_weight_series: Optional[int] = None