feat: Implement Walmart scraper and integrate with existing architecture

- Added Walmart scraper to scrape product data from Walmart.com, including category pages and product details.
- Introduced a stealth browser module to handle bot protection and improve scraping reliability.
- Created a SQLite database for tracking product history, price changes, stock events, and user favorites.
- Developed a Discord bot for user interaction, allowing location setting and stock checking at local stores.
- Implemented a favorites system to manage priority products and categories with custom notification settings.
- Added news aggregation module to fetch and analyze Pokemon TCG news from various sources.
- Created tools for API discovery and monitoring, including a backend monitor for detecting new products.
- Added unit tests for database operations, product filtering, and API endpoints to ensure functionality.
- Enhanced existing modules with improved error handling and logging for better maintainability.

.gitignore

@@ -6,11 +6,26 @@ __pycache__/
 venv/
 .venv/
 
-# Logs and data
+# Logs
 *.log
+
+# Data files (runtime/generated)
 products.json
+data/sessions/
+data/*.json
+data/*.pkl
+*.pkl
+
+# Debug artifacts
 debug_*.png
 
+# Large analysis files
+*.har
+*_analysis.json
+
+# Database
+*.db
+
 # IDE
 .vscode/
 .idea/