Add background and foreground image URLs to event themes

Extended the event theme schema to include `background_image_url`

backend/app/schemas/event_themes.py

@@ -8,8 +8,12 @@ class EventThemeBase(BaseModel):
     name: str = Field(..., min_length=1)  # Ensures name is not empty
     description: Optional[str] = None
     preview_image_url: Optional[str] = None
+    background_image_url: Optional[str] = None
+    foreground_image_url: Optional[str] = None
     color_palette: Dict[str, str] = Field(..., min_items=1)  # Ensures at least one color
+    asset_image_urls: Optional[Dict[str, str]] = None
     fonts: Dict[str, str] = Field(..., min_items=1)  # Ensures at least one font
+    is_active: bool = True
 
     @field_validator('color_palette')
     def validate_color_palette(cls, v):

backend/tests/conftest.py

@@ -197,6 +197,8 @@ def event_theme_fixture(db_session):
         name="Animal Theme",
         description="An animal-themed design for events.",
         preview_image_url="https://example.com/preview/animal_theme.jpg",
+        background_image_url="https://example.com/preview/animal_theme.jpg",
+        foreground_image_url="https://example.com/preview/animal_theme.jpg",
         is_active=True,
         color_palette={
             "primary": "#ff5722",