Refactor configuration management and remove deprecated files

- Consolidated database, file source, and field mapping configurations into dedicated modules under the `config` directory.
- Removed hardcoded database connection details from `migration.py` and replaced them with imports from the new configuration structure.
- Updated `ntfy_utils.py` and `run_incremental_sync.py` to utilize the new configuration imports for cleaner code and better maintainability.
- Deleted `update_config.py` as its contents have been integrated into the new configuration files.
- Added a new `settings.local.json` for managing permissions related to script execution.
- Enhanced the structure of the migration tasks and Excel configurations for better organization and clarity.

ntfy_utils.py

@@ -1,12 +1,12 @@
 # ntfy_utils.py
 import requests
-import config
+from config import NTFY_CONFIG
 
 def send_ntfy(message, title="数据库同步消息", priority="default", tags=None):
     """
     向加密的 ntfy 服务器发送消息
     """
-    conf = config.NTFY_CONFIG
+    conf = NTFY_CONFIG
     if not conf.get('enabled', False):
         return
 
@@ -51,7 +51,7 @@ def send_error(msg):
     send_ntfy(
         message=str(msg),
         title="❌ 同步任务错误",
-        priority=config.NTFY_CONFIG['priority']['error'],
+        priority=NTFY_CONFIG['priority']['error'],
         tags=["warning", "database"]
     )
 
@@ -60,6 +60,6 @@ def send_critical(msg):
     send_ntfy(
         message=str(msg),
         title="🔥 同步服务崩溃",
-        priority=config.NTFY_CONFIG['priority']['critical'],
+        priority=NTFY_CONFIG['priority']['critical'],
         tags=["skull", "critical"]
     )