fix: Claude Desktop 官方供应商添加报错 #3402 (#3405)

* fix: Claude Desktop 官方供应商添加时缺少 ANTHROPIC_BASE_URL 报错

根因：前端 mutation 为 claude-desktop 生成随机 UUID 作为 provider id，
后端 is_official_provider 通过 id 匹配跳过校验，随机 UUID 不匹配导致
走入普通 direct 模式校验并要求 ANTHROPIC_BASE_URL。

修复：
- 前端：claude-desktop + category=official 时使用固定 id "claude-desktop-official"
- 后端：validate_provider / validate_direct_provider / validate_proxy_provider /
  apply_provider_to_paths 增加 category=="official" 兜底检查

Fixes #3402

* fix: restrict Claude Desktop official provider detection

* fix: add Claude Desktop official provider via seed

---------

Co-authored-by: 金恩光 <enguang.jin@gmail.com>
Co-authored-by: Jason <farion1231@gmail.com>

src/lib/query/mutations.ts

@@ -19,8 +19,26 @@ export const useAddProviderMutation = (appId: AppId) => {
       providerInput: Omit<Provider, "id"> & {
         providerKey?: string;
         addToLive?: boolean;
+        ensureClaudeDesktopOfficialSeed?: boolean;
       },
     ) => {
+      const {
+        providerKey: _providerKey,
+        addToLive,
+        ensureClaudeDesktopOfficialSeed,
+        ...rest
+      } = providerInput;
+
+      if (appId === "claude-desktop" && ensureClaudeDesktopOfficialSeed) {
+        await providersApi.ensureClaudeDesktopOfficialProvider();
+        const providers = await providersApi.getAll(appId);
+        const officialProvider = providers["claude-desktop-official"];
+        if (!officialProvider) {
+          throw new Error("Claude Desktop official provider was not created");
+        }
+        return officialProvider;
+      }
+
       let id: string;
 
       if (appId === "opencode" || appId === "openclaw" || appId === "hermes") {
@@ -40,8 +58,6 @@ export const useAddProviderMutation = (appId: AppId) => {
         id = generateUUID();
       }
 
-      const { providerKey: _providerKey, addToLive, ...rest } = providerInput;
-
       const newProvider: Provider = {
         ...rest,
         id,