Add initial project files

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

backend/app/dependencies.py

@@ -0,0 +1,35 @@
+from typing import AsyncGenerator
+
+from fastapi import Depends, HTTPException, status
+from fastapi.security import HTTPBearer, HTTPAuthorizationCredentials
+from sqlalchemy.ext.asyncio import AsyncSession
+from sqlalchemy import select
+
+from app.database import AsyncSessionLocal
+from app.utils.security import decode_token
+
+bearer_scheme = HTTPBearer()
+
+
+async def get_db() -> AsyncGenerator[AsyncSession, None]:
+    async with AsyncSessionLocal() as session:
+        yield session
+
+
+async def get_current_user(
+    credentials: HTTPAuthorizationCredentials = Depends(bearer_scheme),
+    db: AsyncSession = Depends(get_db),
+):
+    from app.models.user import User
+
+    token = credentials.credentials
+    user_id = decode_token(token)
+    if user_id is None:
+        raise HTTPException(status_code=status.HTTP_401_UNAUTHORIZED, detail="Invalid token")
+
+    result = await db.execute(select(User).where(User.id == user_id))
+    user = result.scalar_one_or_none()
+    if user is None:
+        raise HTTPException(status_code=status.HTTP_401_UNAUTHORIZED, detail="User not found")
+
+    return user