fix: TikTok API endpoints and privacy level handling

- Fix publish endpoint: /post/video/init/ → /post/publish/video/init/
- Replace broken /video/list/ with /post/publish/creator_info/query/
- Auto-select valid privacy level from creator options (sandbox fix)
- Update tools, manifest, REST routes for creator_info

src/manifest.ts

@@ -681,15 +681,14 @@ export function getOpenApiSpec(serverUrl: string) {
           responses: { '200': { description: 'Profile info' } },
         },
       },
-      '/api/tiktok/videos': {
+      '/api/tiktok/creator-info': {
         get: {
-          operationId: 'tiktok_get_videos',
-          summary: 'Get TikTok videos',
+          operationId: 'tiktok_get_creator_info',
+          summary: 'Get TikTok creator info',
           parameters: [
-            { name: 'max_count', in: 'query', schema: { type: 'integer' } },
             { name: 'account', in: 'query', schema: { type: 'string' } },
           ],
-          responses: { '200': { description: 'Video list' } },
+          responses: { '200': { description: 'Creator publishing info' } },
         },
       },
       '/api/tiktok/video': {
@@ -1822,31 +1821,30 @@ export function getManifest(serverUrl: string, authEnabled: boolean) {
         examples: [{ account: 'default' }],
       },
       {
-        name: 'tiktok_get_videos',
+        name: 'tiktok_get_creator_info',
         category: 'tiktok',
-        description: 'List recent videos from the authenticated TikTok account',
-        when_to_use: 'User wants to see their recent TikTok videos and performance stats.',
+        description: 'Get TikTok creator publishing info including privacy levels and max video duration',
+        when_to_use: 'User wants to check their TikTok publishing capabilities before posting a video.',
         input_schema: {
           type: 'object',
           properties: {
-            max_count: { type: 'number', description: 'Max videos to return (default: 10, max: 20)' },
             account: { type: 'string', description: 'Which TikTok account to use (default: "default")' },
           },
         },
         returns: {
-          type: 'array',
-          items: {
-            type: 'object',
-            properties: {
-              id: { type: 'string' },
-              title: { type: 'string' },
-              view_count: { type: 'number' },
-              like_count: { type: 'number' },
-              share_url: { type: 'string' },
-            },
+          type: 'object',
+          properties: {
+            creator_username: { type: 'string' },
+            creator_nickname: { type: 'string' },
+            creator_avatar_url: { type: 'string' },
+            privacy_level_options: { type: 'array', items: { type: 'string' } },
+            max_video_post_duration_sec: { type: 'number' },
+            comment_disabled: { type: 'boolean' },
+            duet_disabled: { type: 'boolean' },
+            stitch_disabled: { type: 'boolean' },
           },
         },
-        examples: [{ max_count: 10, account: 'default' }],
+        examples: [{ account: 'default' }],
       },
       {
         name: 'tiktok_create_video',