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.

tools/warmup_session.py

@@ -0,0 +1,119 @@
+"""
+Session Warmup Tool for Pokemon Center
+
+Run this BEFORE starting the monitor to:
+1. Open a stealth browser
+2. Let you manually browse and solve any CAPTCHAs
+3. Save cookies/session for the monitor to reuse
+
+Usage:
+    python warmup_session.py
+
+After running:
+1. Browse Pokemon Center normally for a few minutes
+2. Add items to cart, look at products, etc.
+3. Solve any CAPTCHAs that appear
+4. Press Enter in this terminal when done
+5. The session will be saved and reused by the monitor
+"""
+
+import sys
+import time
+
+print("=" * 60)
+print("Pokemon Center Session Warmup")
+print("=" * 60)
+print()
+
+# Import stealth browser
+try:
+    from .stealth_browser import StealthBrowser
+except ImportError as e:
+    print(f"Error importing stealth browser: {e}")
+    sys.exit(1)
+
+print("Starting stealth browser...")
+print("This will open a Chrome window.")
+print()
+
+browser = StealthBrowser(
+    headless=False,
+    session_name="pokemoncenter"  # Same name used by monitor
+)
+
+try:
+    browser.start()
+    print("[OK] Browser started!")
+    print()
+
+    # Navigate to Pokemon Center
+    print("Navigating to Pokemon Center...")
+    browser.driver.get("https://www.pokemoncenter.com")
+
+    time.sleep(3)
+
+    print()
+    print("=" * 60)
+    print("WARMUP INSTRUCTIONS")
+    print("=" * 60)
+    print("""
+1. If you see a CAPTCHA or "Pardon Our Interruption":
+   - Solve it in the browser window
+   - Wait for the page to load
+
+2. Browse naturally for 2-3 minutes:
+   - Click on some products
+   - Look at different categories
+   - Add something to cart (you don't have to buy)
+   - This builds a legitimate browsing profile
+
+3. Navigate to the TCG section:
+   - https://www.pokemoncenter.com/category/tcg-cards
+
+4. Once you're browsing normally without issues:
+   - Come back here
+   - Press ENTER to save the session
+""")
+    print("=" * 60)
+    print()
+
+    input("Press ENTER when you're done browsing to save the session...")
+
+    print()
+    print("Saving session cookies...")
+    browser._save_cookies()
+
+    # Check how many cookies we got
+    cookies = browser.driver.get_cookies()
+    print(f"[OK] Saved {len(cookies)} cookies")
+
+    # Get current URL for reference
+    current_url = browser.driver.current_url
+    print(f"[OK] Final URL: {current_url}")
+
+    print()
+    print("=" * 60)
+    print("SESSION SAVED!")
+    print("=" * 60)
+    print("""
+Your session has been saved. The monitor will now use these
+cookies when checking Pokemon Center.
+
+Tips for best results:
+- Run the monitor with 3-5 minute check intervals
+- Keep USE_STEALTH_BROWSER = True in config.py
+- If you get blocked again, run this warmup again
+
+Session file: data/sessions/pokemoncenter_cookies.pkl
+""")
+
+except KeyboardInterrupt:
+    print("\nInterrupted by user")
+except Exception as e:
+    print(f"Error: {e}")
+    import traceback
+    traceback.print_exc()
+finally:
+    print("Closing browser...")
+    browser.stop()
+    print("Done!")