TASK-001: Setup FastAPI project structure

- Fixed main.py to include all route routers (posts, users, comments, feed)
- Renamed app/models.py to app/schemas.py and split into proper schema modules
- Fixed schema imports in routes
- Updated app/models/__init__.py to properly export SQLAlchemy models
- Fixed database imports in route files
- App imports and runs correctly

app/main.py

@@ -1,12 +1,18 @@
 """FastAPI application entry point."""
 from contextlib import asynccontextmanager
+from pathlib import Path
 
 from fastapi import FastAPI
 from fastapi.middleware.cors import CORSMiddleware
+from fastapi.staticfiles import StaticFiles
 
 from app.core.config import settings
 from app.db.database import engine, Base
-from app.routers.auth import router as auth_router
+from app.routers.auth import router as auth_router  # noqa: F401
+from app.routes.posts import router as posts_router
+from app.routes.users import router as users_router
+from app.routes.comments import router as comments_router
+from app.routes.feed import router as feed_router
 
 
 @asynccontextmanager
@@ -37,6 +43,15 @@ app.add_middleware(
 
 # Include routers
 app.include_router(auth_router)
+app.include_router(posts_router)
+app.include_router(users_router)
+app.include_router(comments_router)
+app.include_router(feed_router)
+
+# Mount static files for uploads
+UPLOAD_DIR = Path(__file__).parent.parent / "uploads"
+UPLOAD_DIR.mkdir(parents=True, exist_ok=True)
+app.mount("/uploads", StaticFiles(directory=str(UPLOAD_DIR)), name="uploads")
 
 
 @app.get("/")