🎉 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/core/config.py

@@ -0,0 +1,52 @@
+"""
+애플리케이션 설정
+"""
+from pydantic_settings import BaseSettings
+from typing import List
+import os
+
+
+class Settings(BaseSettings):
+    """애플리케이션 설정 클래스"""
+    
+    # 기본 설정
+    APP_NAME: str = "Document Server"
+    DEBUG: bool = True
+    VERSION: str = "0.1.0"
+    
+    # 데이터베이스 설정
+    DATABASE_URL: str = "postgresql+asyncpg://docuser:docpass@localhost:24101/document_db"
+    
+    # Redis 설정
+    REDIS_URL: str = "redis://localhost:24103/0"
+    
+    # JWT 설정
+    SECRET_KEY: str = "your-secret-key-change-this-in-production"
+    ALGORITHM: str = "HS256"
+    ACCESS_TOKEN_EXPIRE_MINUTES: int = 30
+    REFRESH_TOKEN_EXPIRE_DAYS: int = 7
+    
+    # CORS 설정
+    ALLOWED_HOSTS: List[str] = ["http://localhost:24100", "http://127.0.0.1:24100"]
+    
+    # 파일 업로드 설정
+    UPLOAD_DIR: str = "uploads"
+    MAX_FILE_SIZE: int = 100 * 1024 * 1024  # 100MB
+    ALLOWED_EXTENSIONS: List[str] = [".html", ".htm", ".pdf"]
+    
+    # 관리자 계정 설정 (초기 설정용)
+    ADMIN_EMAIL: str = "admin@document-server.local"
+    ADMIN_PASSWORD: str = "admin123"  # 프로덕션에서는 반드시 변경
+    
+    class Config:
+        env_file = ".env"
+        case_sensitive = True
+
+
+# 설정 인스턴스 생성
+settings = Settings()
+
+# 업로드 디렉토리 생성
+os.makedirs(settings.UPLOAD_DIR, exist_ok=True)
+os.makedirs(f"{settings.UPLOAD_DIR}/documents", exist_ok=True)
+os.makedirs(f"{settings.UPLOAD_DIR}/thumbnails", exist_ok=True)