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.

scrapers/base.py

@@ -35,6 +35,50 @@ class BaseScraper(ABC):
 
     site_name: str = "unknown"
 
+    # Terms that indicate a Pokemon product
+    POKEMON_TERMS = [
+        "pokemon", "pokémon", "poke", "tcg",
+        "pikachu", "charizard", "mewtwo", "eevee", "snorlax",
+        "booster", "elite trainer", "etb",
+        "scarlet", "violet", "prismatic", "evolutions",
+    ]
+
+    # Terms that indicate NOT a Pokemon product (false positives from search)
+    EXCLUDE_TERMS = [
+        "ice cube", "oven", "barbie", "hot wheels", "lego",
+        "furniture", "appliance", "kitchen", "bedding",
+        "glitter girls", "masters of the universe", "transformers",
+        "room essentials", "threshold",
+    ]
+
+    def is_pokemon_product(self, product: Product) -> bool:
+        """
+        Check if a product is actually a Pokemon product.
+        Filters out false positives from search results.
+        """
+        name_lower = product.name.lower()
+
+        # Check for exclusion terms first
+        for term in self.EXCLUDE_TERMS:
+            if term in name_lower:
+                return False
+
+        # Check for Pokemon terms
+        for term in self.POKEMON_TERMS:
+            if term in name_lower:
+                return True
+
+        # If no Pokemon terms found, reject it
+        return False
+
+    def filter_pokemon_products(self, products: List[Product]) -> List[Product]:
+        """Filter to only include valid Pokemon products"""
+        filtered = [p for p in products if self.is_pokemon_product(p)]
+        rejected = len(products) - len(filtered)
+        if rejected > 0:
+            logger.info(f"Filtered out {rejected} non-Pokemon products")
+        return filtered
+
     @abstractmethod
     def scrape_category_page(self, url: str) -> List[Product]:
         """