feat: Enhance AI service with verbose logging and command help

- Added a `--verbose` flag to enable detailed debug output for the Gemini AI service.
- Updated `GeminiAIService` constructor to log initialization details when verbose mode is enabled.
- Modified `CreateAIService` to pass the verbose flag to the Gemini configuration.
- Enhanced command help in `ModernCLI` to categorize commands and provide detailed descriptions.
- Refactored `HandleSimpleChatCommand` to accept a pointer to `Rom` instead of a reference.
- Updated `ShowCategoryHelp` to display command categories and examples.
- Improved error handling and logging in `GeminiAIService` for better debugging.

src/cli/modern_cli.h

@@ -31,6 +31,7 @@ class ModernCLI {
  private:
   void SetupCommands();
   void ShowHelp();
+  void ShowCategoryHelp(const std::string& category);
 
   // Command Handlers
   absl::Status HandleAsarPatchCommand(const std::vector<std::string>& args);