[codex] fix Zhipu coding plan presets (#3524)

* fix(presets): update Zhipu coding plan endpoints

* fix(model-fetch): probe /models on versioned /vN base URLs

The model-list probe assumed any base URL not ending in /v1 needs /v1/models appended. For providers whose base URL already ends in a version segment like /v4 (Zhipu/Z.AI GLM Coding Plan at .../api/coding/paas/v4), this produced .../v4/v1/models which 404s, so the "Fetch models" button always failed.

Detect a trailing /v{N} version segment and probe {base}/models first, keeping /v1/models as a fallback candidate for non-/v1 versions. Fixes Codex/OpenCode/OpenClaw/Hermes GLM presets and any other vN-style endpoint, with no behavior change for /v1 or non-versioned URLs.

---------

Co-authored-by: Jason <farion1231@gmail.com>

tests/config/codexChatProviderPresets.test.ts

@@ -44,14 +44,14 @@ const expectedChatPresets = new Map<
   [
     "Zhipu GLM",
     {
-      baseUrl: "https://open.bigmodel.cn/api/paas/v4",
+      baseUrl: "https://open.bigmodel.cn/api/coding/paas/v4",
       contextWindows: { "glm-5.1": 200000 },
     },
   ],
   [
     "Zhipu GLM en",
     {
-      baseUrl: "https://api.z.ai/api/paas/v4",
+      baseUrl: "https://api.z.ai/api/coding/paas/v4",
       contextWindows: { "glm-5.1": 200000 },
     },
   ],