🎉 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/bookmark.py

@@ -0,0 +1,42 @@
+"""
+책갈피 모델
+"""
+from sqlalchemy import Column, String, DateTime, Text, Integer, ForeignKey
+from sqlalchemy.dialects.postgresql import UUID
+from sqlalchemy.orm import relationship
+from sqlalchemy.sql import func
+import uuid
+
+from src.core.database import Base
+
+
+class Bookmark(Base):
+    """책갈피 테이블"""
+    __tablename__ = "bookmarks"
+
+    id = Column(UUID(as_uuid=True), primary_key=True, default=uuid.uuid4)
+    
+    # 연결 정보
+    user_id = Column(UUID(as_uuid=True), ForeignKey("users.id"), nullable=False)
+    document_id = Column(UUID(as_uuid=True), ForeignKey("documents.id"), nullable=False)
+    
+    # 책갈피 정보
+    title = Column(String(200), nullable=False)  # 책갈피 제목
+    description = Column(Text, nullable=True)    # 설명
+    
+    # 위치 정보
+    page_number = Column(Integer, nullable=True)  # 페이지 번호 (추정)
+    scroll_position = Column(Integer, default=0)  # 스크롤 위치 (픽셀)
+    element_id = Column(String(100), nullable=True)  # 특정 요소 ID
+    element_selector = Column(Text, nullable=True)   # CSS 선택자
+    
+    # 메타데이터
+    created_at = Column(DateTime(timezone=True), server_default=func.now())
+    updated_at = Column(DateTime(timezone=True), onupdate=func.now())
+    
+    # 관계
+    user = relationship("User", backref="bookmarks")
+    document = relationship("Document", back_populates="bookmarks")
+
+    def __repr__(self):
+        return f"<Bookmark(title='{self.title}', document='{self.document_id}')>"