Phase 7: End-to-End API Testing - Database setup, migrations, and application fixes

- Switched from psycopg2 to asyncpg for async SQLAlchemy support
- Fixed router registration in main.py - removed duplicate prefixes
- Added user_data export to routers/__init__.py
- Refactored decks router to use DeckManager service layer
- Integrated FuzzyCardMatcher into card_router search endpoints
- Made WishlistCreate.card_id optional for proper schema validation
- Set PostgreSQL password and configured scram-sha-256 auth
- Updated alembic.ini to use local PostgreSQL instead of Docker hostname
- Created generic_schemas.py for reusable schema patterns
- Added test_routers.py and test_schema_validation.py test files
- All 6 Alembic migrations applied successfully (37 tables created)
- Application running on port 8000 with all services connected

backend/app/schemas/card_import_schemas.py

@@ -111,19 +111,3 @@ class UserCardImportRecordResponse(BaseModel):
     
     model_config = ConfigDict(from_attributes=True)
 
-
-# Generic response models
-class MessageResponse(BaseModel):
-    """Generic message response."""
-    message: str
-
-
-class CountResponse(BaseModel):
-    """Generic count response."""
-    count: int
-
-
-class ErrorResponse(BaseModel):
-    """Error response with details."""
-    detail: str
-    error_code: Optional[str] = None