feat: enhance project configuration and improve data export functionality

- Updated `.gitignore` to streamline ignored files and added logging for common sites.
- Expanded `config.py` with new configurations for Weixin and Redis, and improved database connection settings.
- Refined `README.md` to clarify project structure and usage instructions.
- Enhanced `requirements.txt` with additional dependencies for MongoDB and Redis support.
- Refactored multiple spider scripts to utilize a session-based approach for HTTP requests, improving error handling and proxy management.
- Updated `export_lawyers_excel.py` to include a default timestamp for data exports.

.gitignore

@@ -1,36 +1,6 @@
-# Python
-__pycache__/
-*.py[cod]
-*$py.class
-
-# Build / packaging
-build/
-dist/
-*.egg-info/
-.eggs/
-
-# Virtual environments
 .venv/
-venv/
-env/
-
-# Test / type caches
-.pytest_cache/
-.mypy_cache/
-.ruff_cache/
-
-# IDE
-.vscode/
-.idea/
-
-# OS
-.DS_Store
-Thumbs.db
-
-# Local runtime files
-*.log
-logs/
-data/
-
-# accidental local files
-=*
+__pycache__/
+*.pyc
+common_sites/*.log
+logs/*
+data/*