feat(codex): restore Kimi For Coding preset with thinking on by default

The Kimi For Coding preset was removed (74104946) because the coding
endpoint (api.kimi.com/coding/v1) enforces a User-Agent whitelist that
rejects Codex's default codex-cli UA with 403. The provider-level custom
User-Agent feature now lets users override the UA (to claude-cli/*) under
proxy takeover, so the preset can be restored.

- Re-add the Codex Kimi For Coding preset (openai_chat, kimi-for-coding,
  256K context) in the same position it was removed from.
- Enable thinking mode by default via codexChatReasoning (supportsThinking
  true, thinkingParam "thinking"), mirroring the general Kimi preset since
  both target the same Moonshot model family. The proxy injects
  thinking:{type:enabled} when Codex requests reasoning.
- Restore the trilingual user-manual row to "Kimi / Kimi For Coding".

Note: this preset requires proxy takeover and a whitelisted custom
User-Agent to work; the default codex-cli UA still gets 403.

src/config/codexProviderPresets.ts

@@ -448,6 +448,36 @@ requires_openai_auth = true`,
     icon: "kimi",
     iconColor: "#6366F1",
   },
+  {
+    name: "Kimi For Coding",
+    websiteUrl: "https://www.kimi.com/code/docs/",
+    apiKeyUrl: "https://www.kimi.com/code/",
+    auth: generateThirdPartyAuth(""),
+    config: generateThirdPartyConfig(
+      "kimi_coding",
+      "https://api.kimi.com/coding/v1",
+      "kimi-for-coding",
+    ),
+    endpointCandidates: ["https://api.kimi.com/coding/v1"],
+    apiFormat: "openai_chat",
+    modelCatalog: modelCatalog([
+      {
+        model: "kimi-for-coding",
+        displayName: "Kimi For Coding",
+        contextWindow: 262144,
+      },
+    ]),
+    codexChatReasoning: {
+      supportsThinking: true,
+      supportsEffort: false,
+      thinkingParam: "thinking",
+      effortParam: "none",
+      outputFormat: "reasoning_content",
+    },
+    category: "cn_official",
+    icon: "kimi",
+    iconColor: "#6366F1",
+  },
   {
     name: "StepFun",
     websiteUrl: "https://platform.stepfun.com/step-plan",