Add initial project files

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

backend/app/routers/auth.py

@@ -0,0 +1,39 @@
+from fastapi import APIRouter, Depends, HTTPException, status
+from sqlalchemy.ext.asyncio import AsyncSession
+from sqlalchemy import select
+
+from app.dependencies import get_db
+from app.models.user import User
+from app.schemas.user import UserCreate, Token, LoginRequest
+from app.utils.security import hash_password, verify_password, create_token
+
+router = APIRouter(prefix="/api/auth", tags=["auth"])
+
+
+@router.post("/register", response_model=Token, status_code=status.HTTP_201_CREATED)
+async def register(body: UserCreate, db: AsyncSession = Depends(get_db)):
+    result = await db.execute(select(User).where(User.email == body.email))
+    if result.scalar_one_or_none():
+        raise HTTPException(status_code=status.HTTP_409_CONFLICT, detail="Email already registered")
+
+    user = User(
+        email=body.email,
+        password_hash=hash_password(body.password),
+        display_name=body.display_name or body.email.split("@")[0],
+    )
+    db.add(user)
+    await db.commit()
+    await db.refresh(user)
+
+    return Token(access_token=create_token(user.id))
+
+
+@router.post("/login", response_model=Token)
+async def login(body: LoginRequest, db: AsyncSession = Depends(get_db)):
+    result = await db.execute(select(User).where(User.email == body.email))
+    user = result.scalar_one_or_none()
+
+    if not user or not verify_password(body.password, user.password_hash):
+        raise HTTPException(status_code=status.HTTP_401_UNAUTHORIZED, detail="Invalid credentials")
+
+    return Token(access_token=create_token(user.id))