feat: upgrade to V1.2 - Tags, Click Stats, and Robust WebDAV

- add Tagging system (backend and frontend)
- add Click count statistics and redirection logic
- add config.example.py
- fix WebDAV MKCOL 405 error and response handling
- fix redirection loop during force password change
- audit SQL queries for security

config.example.py

@@ -0,0 +1,29 @@
+# ToNav 配置示例文件
+# 使用时请重命名为 config.py 并根据实际情况修改
+
+import os
+from datetime import timedelta
+
+class Config:
+    # 安全密钥，建议通过环境变量设置
+    SECRET_KEY = os.environ.get('TONAV_SECRET_KEY', 'default-secret-key-7306783874')
+    
+    # 数据库路径
+    DATABASE_PATH = os.path.join(os.path.dirname(__file__), 'tonav.db')
+    
+    # 服务运行参数
+    HOST = '127.0.0.1'
+    PORT = 9519
+    DEBUG = False
+    
+    # 健康检查间隔 (秒)
+    HEALTH_CHECK_INTERVAL = 60
+    # 健康检查超时 (秒)
+    HEALTH_CHECK_TIMEOUT = 15
+    
+    # 日志配置
+    LOG_FILE = os.path.join(os.path.dirname(__file__), 'tonav.log')
+    LOG_LEVEL = 'INFO'
+
+    # 会话有效期
+    PERMANENT_SESSION_LIFETIME = timedelta(days=7)