feat: complete 89cat rebrand, token server, API validation, skills tabs

- Phase 1: rename app identifiers (package/electron-builder/main process)
- Phase 4: cat89 provider + port-pinger for api2.is89.com:898902-898909
- Phase 5: skills page category tabs (89 plugins/OpenClaw/other)
- Phase 7: /api/cat89/validate-key endpoint with auto-ping

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

package.json

@@ -1,5 +1,5 @@
 {
-    "name": "clawx",
+    "name": "cat89",
     "version": "0.4.8-alpha.0",
     "pnpm": {
         "onlyBuiltDependencies": [
@@ -25,9 +25,9 @@
             ]
         }
     },
-    "description": "ClawX - Graphical AI Assistant based on OpenClaw",
+    "description": "89猫 - Graphical AI Assistant based on OpenClaw",
     "main": "dist-electron/main/index.js",
-    "author": "ClawX Team",
+    "author": "89猫 Team",
     "license": "MIT",
     "private": true,
     "scripts": {