feat: Add AI service configuration flags and update service factory for improved flexibility

src/cli/flags.cc

@@ -3,3 +3,14 @@
 #include "absl/flags/flag.h"
 
 ABSL_FLAG(std::string, rom, "", "Path to the ROM file");
+
+// AI Service Configuration Flags
+ABSL_FLAG(std::string, ai_provider, "mock",
+          "AI provider to use: 'mock' (default), 'ollama', or 'gemini'");
+ABSL_FLAG(std::string, ai_model, "",
+          "AI model to use (provider-specific, e.g., 'llama3' for Ollama, "
+          "'gemini-1.5-flash' for Gemini)");
+ABSL_FLAG(std::string, gemini_api_key, "",
+          "Gemini API key (can also use GEMINI_API_KEY environment variable)");
+ABSL_FLAG(std::string, ollama_host, "http://localhost:11434",
+          "Ollama server host URL");