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.

config/__init__.py

@@ -0,0 +1,32 @@
+# config/__init__.py
+# 统一配置导出接口
+
+# 数据库配置
+from .database import SQL_SERVER_CONFIG, SQL_SERVER_CONN, DB_CONFIG, ACCESS_DRIVER
+
+# 文件路径配置
+from .file_sources import SYNC_MAPPING, EXCEL_CONFIGS, MIGRATION_TASKS
+
+# 字段映射配置
+from .field_mappings import TABLE_SCHEMA, CONTRACT_MAPPING
+
+# 应用设置
+from .app_settings import (
+    LOG_TABLE_CONFIG, NTFY_CONFIG,
+    POLL_INTERVAL, BATCH_SIZE, CACHE_DIR, TEMP_DIR,
+    EXECUTION_CARD_FIELDS, CONTRACT_DATA_FIELDS, CONTRACT_DATA_MAPPING
+)
+
+# 统一导出列表
+__all__ = [
+    # Database
+    'SQL_SERVER_CONFIG', 'SQL_SERVER_CONN', 'DB_CONFIG', 'ACCESS_DRIVER',
+    # File Sources
+    'SYNC_MAPPING', 'EXCEL_CONFIGS', 'MIGRATION_TASKS',
+    # Field Mappings
+    'TABLE_SCHEMA', 'CONTRACT_MAPPING',
+    # App Settings
+    'LOG_TABLE_CONFIG', 'NTFY_CONFIG',
+    'POLL_INTERVAL', 'BATCH_SIZE', 'CACHE_DIR', 'TEMP_DIR',
+    'EXECUTION_CARD_FIELDS', 'CONTRACT_DATA_FIELDS', 'CONTRACT_DATA_MAPPING'
+]