Test GLM-5.2 (753B MoE) on Novita; fallback is Qwen2.5-72B

User testing GLM-5.2 for quality and speed. If unsatisfactory,
revert to Qwen/Qwen2.5-72B-Instruct (commit 0e9045f).

Generated with Devin (https://devin.ai)

Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com>

app.py

@@ -941,7 +941,7 @@ def respond(message, history):
     for attempt in range(3):
         try:
             response = client.chat_completion(
-                model="Qwen/Qwen2.5-72B-Instruct",  # 8B too small for complex prompt; Qwen2.5-72B confirmed working on Novita
+                model="zai-org/GLM-5.2",  # testing; fallback is Qwen/Qwen2.5-72B-Instruct if quality/speed unsatisfactory
                 messages=messages,
                 max_tokens=512,
             )