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>

migrations/env.py

@@ -0,0 +1,42 @@
+from logging.config import fileConfig
+
+from alembic import context
+from sqlalchemy import create_engine, pool
+
+from app import models  # noqa: F401 (모델을 등록해 metadata에 반영)
+from app.config import settings
+from app.database import Base
+
+config = context.config
+# settings.database_url은 비밀번호에 %가 포함될 수 있어 configparser 보간을 거치지 않고 직접 사용한다.
+DATABASE_URL = settings.database_url
+
+if config.config_file_name is not None:
+    fileConfig(config.config_file_name)
+
+target_metadata = Base.metadata
+
+
+def run_migrations_offline() -> None:
+    context.configure(
+        url=DATABASE_URL,
+        target_metadata=target_metadata,
+        literal_binds=True,
+        dialect_opts={"paramstyle": "named"},
+    )
+    with context.begin_transaction():
+        context.run_migrations()
+
+
+def run_migrations_online() -> None:
+    connectable = create_engine(DATABASE_URL, poolclass=pool.NullPool)
+    with connectable.connect() as connection:
+        context.configure(connection=connection, target_metadata=target_metadata)
+        with context.begin_transaction():
+            context.run_migrations()
+
+
+if context.is_offline_mode():
+    run_migrations_offline()
+else:
+    run_migrations_online()