fix: update default model names to match CU Cloud AI gateway

The gateway returns HTTP 404 because qwen3.5-plus and qwen3-coder-plus
are not valid model IDs. Updated defaults to Qwen3.5-397B-A17B and
Qwen3-235B-A22B which are available on the CU Cloud gateway.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

ai_review/config.py

@@ -6,8 +6,8 @@ import os
 # ─── 配置（全部从环境变量读取） ──────────────────────────────
 API_URL = os.environ.get("AI_REVIEW_API_URL", "https://coding.dashscope.aliyuncs.com/v1/chat/completions")
 API_KEY = os.environ.get("AI_REVIEW_API_KEY", "")
-MODEL = os.environ.get("AI_REVIEW_MODEL", "qwen3.5-plus")
-TRIAGE_MODEL = os.environ.get("AI_REVIEW_TRIAGE_MODEL", "qwen3-coder-plus")
+MODEL = os.environ.get("AI_REVIEW_MODEL", "Qwen3.5-397B-A17B")
+TRIAGE_MODEL = os.environ.get("AI_REVIEW_TRIAGE_MODEL", "Qwen3-235B-A22B")
 FEISHU_WEBHOOK = os.environ.get("FEISHU_WEBHOOK_URL", "")
 
 MAX_DIFF_LINES = int(os.environ.get("AI_REVIEW_MAX_DIFF_LINES", "2000"))

ai_review/llm.py

@@ -139,8 +139,12 @@ def call_llm(system_msg, user_msg, max_tokens=4096, timeout=300, model=None, ena
         "max_tokens": max_tokens
     }
     if enable_thinking:
+        # 兼容联通云 AI 网关（OpenAI 兼容协议）
+        # 部分网关通过 temperature=1 + 去掉 system 来触发 thinking
+        # 也尝试发送通用 thinking 参数，网关会忽略不支持的字段
         payload["enable_thinking"] = True
         payload["thinking_budget"] = 8192
+        payload["temperature"] = 1  # thinking 模型通常要求 temperature=1
     headers = {
         "Content-Type": "application/json",
         "Authorization": f"Bearer {API_KEY}"