fix(kimi): resolve Kimi Code API 403 errors and User-Agent restrictions (#3549)

* fix(kimi): resolve Kimi Code API 403 errors and User-Agent restrictions

Kimi Code subscription keys require a whitelisted coding-agent User-Agent to avoid access_terminated_error 403s. This adds User-Agent probing and caching for Kimi Code endpoints.

Co-authored-by: Cursor <cursoragent@cursor.com>

* fix(kimi): omit temperature for kimi-for-coding API calls

Kimi Code rejects any non-default temperature with HTTP 400, which broke deep research probes and low-temp LLM rounds.

Co-authored-by: Cursor <cursoragent@cursor.com>

---------

Co-authored-by: Cursor <cursoragent@cursor.com>

routes/webhook_routes.py

@@ -198,6 +198,8 @@ def setup_webhook_routes(
         "opencode-go": "https://opencode.ai/zen/go/v1",
         "fireworks": "https://api.fireworks.ai/inference/v1",
         "venice": "https://api.venice.ai/api/v1",
+        "kimi-code": "https://api.kimi.com/coding/v1",
+        "kimicode": "https://api.kimi.com/coding/v1",
     }
 
     # Model prefix → provider mapping for auto-detection
@@ -210,6 +212,8 @@ def setup_webhook_routes(
         "mistral": "mistral",
         "llama": "groq",
         "mixtral": "groq",
+        "kimi-for-coding": "kimi-code",
+        "kimi": "kimi-code",
     }
 
     def _resolve_base_url(model: Optional[str], provider: Optional[str]) -> Optional[str]: