Initial commit: habit tracker PWA with Google OAuth, push notifications

FastAPI + SQLAlchemy/Alembic + MariaDB backend with Jinja2/htmx/Alpine
server-rendered frontend. Multi-user via Google OAuth, daily habit
tracking, monthly/weekly history views, Web Push reminders via
APScheduler, and PWA support (manifest, service worker, offline caching).

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

app/routers/push.py

@@ -0,0 +1,46 @@
+from fastapi import APIRouter, Depends, Request
+from pydantic import BaseModel
+from sqlalchemy.orm import Session
+
+from app.config import settings
+from app.database import get_db
+from app.models.user import User
+from app.schemas.push import PushSubscribeRequest
+from app.security import require_login
+from app.services import push_service
+
+router = APIRouter(prefix="/api/push", tags=["push"], dependencies=[Depends(require_login)])
+
+
+class UnsubscribeRequest(BaseModel):
+    endpoint: str
+
+
+@router.get("/vapid-public-key")
+def get_vapid_public_key():
+    return {"publicKey": settings.vapid_public_key}
+
+
+@router.post("/subscribe")
+def subscribe(
+    data: PushSubscribeRequest,
+    request: Request,
+    db: Session = Depends(get_db),
+    current_user: User = Depends(require_login),
+):
+    push_service.save_subscription(db, current_user.id, data, user_agent=request.headers.get("user-agent"))
+    return {"ok": True}
+
+
+@router.post("/unsubscribe")
+def unsubscribe(
+    data: UnsubscribeRequest, db: Session = Depends(get_db), current_user: User = Depends(require_login)
+):
+    push_service.delete_subscription(db, data.endpoint)
+    return {"ok": True}
+
+
+@router.post("/test")
+def send_test(db: Session = Depends(get_db), current_user: User = Depends(require_login)):
+    sent = push_service.send_to_user(db, current_user.id, title="습관 트래커", body="테스트 알림입니다.")
+    return {"sent": sent}