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.

tradingagents/llm_clients/factory.py

@@ -4,7 +4,9 @@ from .base_client import BaseLLMClient
 
 # Providers that use the OpenAI-compatible chat completions API
 _OPENAI_COMPATIBLE = (
-    "openai", "xai", "deepseek", "qwen", "glm",
+    "openai", "xai", "deepseek",
+    "qwen", "qwen-cn",
+    "glm", "glm-cn",
     "minimax", "minimax-cn",
     "ollama", "openrouter",
 )