Implement case-insensitive command processing across all bot modules

Added normalize_input() function to BaseModule for consistent lowercase conversion of user input. Updated all command modules to use normalization for commands, arguments, pet names, location names, gym names, and item names. Players can now use any capitalization for commands and arguments.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

modules/base_module.py

@@ -12,6 +12,15 @@ class BaseModule(ABC):
         self.database = database
         self.game_engine = game_engine
     
+    @staticmethod
+    def normalize_input(user_input):
+        """Normalize user input by converting to lowercase for case-insensitive command processing"""
+        if isinstance(user_input, str):
+            return user_input.lower()
+        elif isinstance(user_input, list):
+            return [item.lower() if isinstance(item, str) else item for item in user_input]
+        return user_input
+    
     @abstractmethod
     def get_commands(self):
         """Return list of commands this module handles"""