feat: remove asyncio dependencies from core api, assistant, and command handlers converting to synchronous execution

pr/commands/handlers.py

@@ -12,7 +12,7 @@ from pr.ui import Colors
 from pr.editor import RPEditor
 
 
-def handle_command(assistant, command):
+async def handle_command(assistant, command):
     command_parts = command.strip().split(maxsplit=1)
     cmd = command_parts[0].lower()
 
@@ -121,7 +121,7 @@ def handle_command(assistant, command):
             print(f"Model set to: {Colors.GREEN}{assistant.model}{Colors.RESET}")
 
     elif cmd == "/models":
-        models = list_models(assistant.model_list_url, assistant.api_key)
+        models = await list_models(assistant.model_list_url, assistant.api_key)
         if isinstance(models, dict) and "error" in models:
             print(f"{Colors.RED}Error fetching models: {models['error']}{Colors.RESET}")
         else: