🎉 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/schemas/auth.py

@@ -0,0 +1,56 @@
+"""
+인증 관련 스키마
+"""
+from pydantic import BaseModel, EmailStr
+from typing import Optional
+from datetime import datetime
+
+
+class LoginRequest(BaseModel):
+    """로그인 요청"""
+    email: EmailStr
+    password: str
+
+
+class TokenResponse(BaseModel):
+    """토큰 응답"""
+    access_token: str
+    refresh_token: str
+    token_type: str = "bearer"
+    expires_in: int  # 초 단위
+
+
+class RefreshTokenRequest(BaseModel):
+    """토큰 갱신 요청"""
+    refresh_token: str
+
+
+class UserInfo(BaseModel):
+    """사용자 정보"""
+    id: str
+    email: str
+    full_name: Optional[str] = None
+    is_active: bool
+    is_admin: bool
+    theme: str
+    language: str
+    timezone: str
+    created_at: datetime
+    last_login: Optional[datetime] = None
+
+    class Config:
+        from_attributes = True
+
+
+class ChangePasswordRequest(BaseModel):
+    """비밀번호 변경 요청"""
+    current_password: str
+    new_password: str
+
+
+class CreateUserRequest(BaseModel):
+    """사용자 생성 요청 (관리자용)"""
+    email: EmailStr
+    password: str
+    full_name: Optional[str] = None
+    is_admin: bool = False