🎉 Initial commit: Document Server MVP

✨ Features implemented:
- FastAPI backend with JWT authentication
- PostgreSQL database with async SQLAlchemy
- HTML document viewer with smart highlighting
- Note system connected to highlights (1:1 relationship)
- Bookmark system for quick navigation
- Integrated search (documents + notes)
- Tag system for document organization
- Docker containerization with Nginx

🔧 Technical stack:
- Backend: FastAPI + PostgreSQL + Redis
- Frontend: Alpine.js + Tailwind CSS
- Authentication: JWT tokens
- File handling: HTML + PDF support
- Search: Full-text search with relevance scoring

📋 Core functionality:
- Text selection → Highlight creation
- Highlight → Note attachment
- Note management with search/filtering
- Bookmark creation at scroll positions
- Document upload with metadata
- User management (admin creates accounts)

backend/src/models/__init__.py

@@ -0,0 +1,17 @@
+"""
+모델 패키지 초기화
+"""
+from src.models.user import User
+from src.models.document import Document, Tag
+from src.models.highlight import Highlight
+from src.models.note import Note
+from src.models.bookmark import Bookmark
+
+__all__ = [
+    "User",
+    "Document", 
+    "Tag",
+    "Highlight",
+    "Note",
+    "Bookmark",
+]