feat: implement Phase 0 auth system, setup wizard, and Docker config

- Add users table to migration, User ORM model
- Implement JWT+TOTP auth API (login, refresh, me, change-password)
- Add first-run setup wizard with rate-limited admin creation,
  TOTP QR enrollment (secret saved only after verification), and
  NAS path verification — served as Jinja2 single-page HTML
- Add setup redirect middleware (bypasses /health, /docs, /openapi.json)
- Mount config.yaml, scripts, logs volumes in docker-compose
- Route API vs frontend traffic in Caddyfile
- Include admin seed script as CLI fallback

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

app/models/user.py

@@ -0,0 +1,22 @@
+"""users 테이블 ORM"""
+
+from datetime import datetime
+
+from sqlalchemy import BigInteger, Boolean, DateTime, String, Text
+from sqlalchemy.orm import Mapped, mapped_column
+
+from core.database import Base
+
+
+class User(Base):
+    __tablename__ = "users"
+
+    id: Mapped[int] = mapped_column(BigInteger, primary_key=True)
+    username: Mapped[str] = mapped_column(String(50), unique=True, nullable=False)
+    password_hash: Mapped[str] = mapped_column(Text, nullable=False)
+    totp_secret: Mapped[str | None] = mapped_column(String(64))
+    is_active: Mapped[bool] = mapped_column(Boolean, default=True)
+    created_at: Mapped[datetime] = mapped_column(
+        DateTime(timezone=True), default=datetime.now
+    )
+    last_login_at: Mapped[datetime | None] = mapped_column(DateTime(timezone=True))