Add RSS Feed Subscription Service

- RSS/Atom 피드 구독 및 관리 서비스 구현
- 자동 업데이트 스케줄러 포함 (기본 15분 주기)
- 피드 엔트리 읽음/별표 상태 관리
- 카테고리별 분류 기능
- OPML 내보내기 지원
- MongoDB 데이터 저장, Redis 캐싱
- Docker 컨테이너 구성 (포트 8017)

🤖 Generated with Claude Code (https://claude.ai/code)

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

services/rss-feed/backend/app/models.py

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+from pydantic import BaseModel, Field, HttpUrl
+from typing import Optional, List, Dict, Any
+from datetime import datetime
+from enum import Enum
+
+class FeedStatus(str, Enum):
+    ACTIVE = "active"
+    INACTIVE = "inactive"
+    ERROR = "error"
+
+class FeedCategory(str, Enum):
+    NEWS = "news"
+    TECH = "tech"
+    BUSINESS = "business"
+    SCIENCE = "science"
+    HEALTH = "health"
+    SPORTS = "sports"
+    ENTERTAINMENT = "entertainment"
+    LIFESTYLE = "lifestyle"
+    POLITICS = "politics"
+    OTHER = "other"
+
+class FeedSubscription(BaseModel):
+    id: Optional[str] = Field(None, alias="_id")
+    title: str
+    url: HttpUrl
+    description: Optional[str] = None
+    category: FeedCategory = FeedCategory.OTHER
+    status: FeedStatus = FeedStatus.ACTIVE
+    update_interval: int = 900  # seconds
+    last_fetch: Optional[datetime] = None
+    last_error: Optional[str] = None
+    error_count: int = 0
+    created_at: datetime = Field(default_factory=datetime.now)
+    updated_at: datetime = Field(default_factory=datetime.now)
+    metadata: Dict[str, Any] = {}
+
+class FeedEntry(BaseModel):
+    id: Optional[str] = Field(None, alias="_id")
+    feed_id: str
+    entry_id: str  # RSS entry unique ID
+    title: str
+    link: str
+    summary: Optional[str] = None
+    content: Optional[str] = None
+    author: Optional[str] = None
+    published: Optional[datetime] = None
+    updated: Optional[datetime] = None
+    categories: List[str] = []
+    thumbnail: Optional[str] = None
+    enclosures: List[Dict[str, Any]] = []
+    is_read: bool = False
+    is_starred: bool = False
+    created_at: datetime = Field(default_factory=datetime.now)
+
+class CreateFeedRequest(BaseModel):
+    url: HttpUrl
+    title: Optional[str] = None
+    category: FeedCategory = FeedCategory.OTHER
+    update_interval: Optional[int] = 900
+
+class UpdateFeedRequest(BaseModel):
+    title: Optional[str] = None
+    category: Optional[FeedCategory] = None
+    update_interval: Optional[int] = None
+    status: Optional[FeedStatus] = None
+
+class FeedStatistics(BaseModel):
+    feed_id: str
+    total_entries: int
+    unread_entries: int
+    starred_entries: int
+    last_update: Optional[datetime]
+    error_rate: float