fix(publish/dongchedi): route imagex traffic through session.fetch

Use the account session for imagex apply/upload/commit so the requests carry
the same cookies/UA the bind console saw, instead of falling out of the
session via a bare Node fetch — bytedance imagex was rejecting these as
unauthenticated under the bound session. Also align the binding console URL
with the v2 publish article path.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

apps/desktop-client/src/main/account-binder.ts

@@ -2910,7 +2910,7 @@ const publishBindingDefinitions: Record<string, PublishPlatformBindingDefinition
     id: "dongchedi",
     label: "懂车帝",
     loginUrl: "https://mp.dcdapp.com/login",
-    consoleUrl: "https://mp.dcdapp.com/content/article/create",
+    consoleUrl: "https://mp.dcdapp.com/profile_v2/publish/article",
     detect: detectDongchedi,
   },
 };