Auth: switch Kimi Coding to built-in provider

docs/concepts/model-providers.md

@@ -158,30 +158,19 @@ Moonshot uses OpenAI-compatible endpoints, so configure it as a custom provider:
 }
 ```
 
-### Kimi Code
+### Kimi Coding
 
-Kimi Code uses a dedicated endpoint and key (separate from Moonshot):
+Kimi Coding uses Moonshot AI's Anthropic-compatible endpoint:
 
-- Provider: `kimi-code`
-- Auth: `KIMICODE_API_KEY`
-- Example model: `kimi-code/kimi-for-coding`
+- Provider: `kimi-coding`
+- Auth: `KIMI_API_KEY`
+- Example model: `kimi-coding/k2p5`
 
 ```json5
 {
-  env: { KIMICODE_API_KEY: "sk-..." },
+  env: { KIMI_API_KEY: "sk-..." },
   agents: {
-    defaults: { model: { primary: "kimi-code/kimi-for-coding" } }
-  },
-  models: {
-    mode: "merge",
-    providers: {
-      "kimi-code": {
-        baseUrl: "https://api.kimi.com/coding/v1",
-        apiKey: "${KIMICODE_API_KEY}",
-        api: "openai-completions",
-        models: [{ id: "kimi-for-coding", name: "Kimi For Coding" }]
-      }
-    }
+    defaults: { model: { primary: "kimi-coding/k2p5" } }
   }
 }
 ```