feat: home-gateway 초기 구성 — Mac mini에서 GPU 서버로 전면 이전

OrbStack 라이선스 만료로 Mac mini Docker 서비스를 GPU 서버로 통합.
nginx → Caddy 전환, 12개 서브도메인 자동 HTTPS, fail2ban Caddy JSON 연동.

주요 변경:
- home-caddy: Caddy 리버스 프록시 (Let's Encrypt 자동 HTTPS)
- home-fail2ban: Caddy JSON 로그 기반 보안 모니터링
- home-ddns: Cloudflare DDNS (API 키 .env 분리)
- gpu-hub-api/web: AI 백엔드 라우터 + 웹 UI (gpu-services에서 이전)
- AI 런타임(Ollama) 내부망 전용, 외부는 gpu-hub 인증 게이트웨이 경유

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

hub-api/routers/auth.py

@@ -0,0 +1,79 @@
+from fastapi import APIRouter, Request, Response
+from pydantic import BaseModel
+
+from config import settings
+from middleware.auth import (
+    check_login_rate_limit,
+    create_token,
+    record_login_attempt,
+)
+
+router = APIRouter(prefix="/auth", tags=["auth"])
+
+
+class LoginRequest(BaseModel):
+    password: str
+
+
+class LoginResponse(BaseModel):
+    role: str
+    token: str
+
+
+@router.post("/login")
+async def login(body: LoginRequest, request: Request, response: Response):
+    ip = request.client.host if request.client else "unknown"
+
+    if not check_login_rate_limit(ip):
+        return _error_response(429, "Too many login attempts. Try again in 1 minute.")
+
+    record_login_attempt(ip)
+
+    if body.password == settings.owner_password:
+        role = "owner"
+    elif body.password == settings.guest_password:
+        role = "guest"
+    else:
+        return _error_response(401, "Invalid password")
+
+    token = create_token(role)
+
+    # Set httpOnly cookie for web UI
+    response.set_cookie(
+        key="token",
+        value=token,
+        httponly=True,
+        samesite="lax",
+        max_age=settings.jwt_expire_hours * 3600,
+    )
+
+    return LoginResponse(role=role, token=token)
+
+
+@router.get("/me")
+async def me(request: Request):
+    role = getattr(request.state, "role", "anonymous")
+    if role == "anonymous":
+        return _error_response(401, "Not authenticated")
+    return {"role": role}
+
+
+@router.post("/logout")
+async def logout(response: Response):
+    response.delete_cookie("token")
+    return {"ok": True}
+
+
+def _error_response(status_code: int, message: str):
+    from fastapi.responses import JSONResponse
+
+    return JSONResponse(
+        status_code=status_code,
+        content={
+            "error": {
+                "message": message,
+                "type": "auth_error",
+                "code": f"auth_{status_code}",
+            }
+        },
+    )