Add Claude Desktop official preset

- Add Claude Desktop Official to the Claude Desktop preset list.
- Treat selected official presets as official mode in the form.
- Cover the official preset with a preset-order regression test.

tests/config/providerPresetOrder.test.ts

@@ -37,6 +37,15 @@ describe("provider preset order", () => {
     ]);
   });
 
+  it("Claude Desktop 预设包含官方登录入口", () => {
+    expect(claudeDesktopProviderPresets[0]).toMatchObject({
+      name: "Claude Desktop Official",
+      category: "official",
+      baseUrl: "",
+      mode: "direct",
+    });
+  });
+
   it("Codex 预设把 PatewayAI 放在胜算云后面", () => {
     expectInOrder(namesOf(codexProviderPresets), ["Shengsuanyun", "PatewayAI"]);
   });