feat(llm): GLM dual-region split + catalog refresh

Zhipu serves GLM under two brands with separate accounts (Z.AI
international vs BigModel China); the CLI URL pointed at one while
the openai_client default pointed at the other. Split into glm +
glm-cn with secondary region prompt (same UX as Qwen + MiniMax).
Catalog adds glm-5-turbo and glm-4.5-air per docs.z.ai.

cli/main.py

@@ -566,6 +566,8 @@ def get_user_selections():
         selected_llm_provider, backend_url = ask_qwen_region()
     elif selected_llm_provider == "minimax":
         selected_llm_provider, backend_url = ask_minimax_region()
+    elif selected_llm_provider == "glm":
+        selected_llm_provider, backend_url = ask_glm_region()
 
     # Step 7: Thinking agents
     console.print(