Initial commit: Happy Up monorepo through Sprint 5.

Document-driven MVP with FastAPI backend, Vue H5, WeChat mini shell, product demo, and Docker dev stack.

Co-authored-by: Cursor <cursoragent@cursor.com>

apps/api/app/routers/auth.py

@@ -0,0 +1,32 @@
+from fastapi import APIRouter, HTTPException, Request
+from fastapi.responses import JSONResponse
+
+from app.core.response import error, ok
+from app.db.session import get_db
+from app.schemas.models import LoginRequest
+from app.services import auth as auth_service
+from sqlalchemy.orm import Session
+from fastapi import Depends
+
+router = APIRouter(prefix="/api/auth", tags=["Auth"])
+
+
+@router.post("/login")
+def login(body: LoginRequest, request: Request, db: Session = Depends(get_db)):
+    try:
+        user, token = auth_service.authenticate(db, body)
+    except ValueError as exc:
+        if str(exc) == "invalid_code":
+            return JSONResponse(
+                status_code=401,
+                content=error(10002, "invalid_verification_code", request.state.request_id),
+            )
+        return JSONResponse(
+            status_code=400,
+            content=error(10003, str(exc), request.state.request_id),
+        )
+
+    return ok(
+        {"token": token, "user": auth_service.user_to_dict(user)},
+        request_id=request.state.request_id,
+    )