fix(adapters): add categories to telegram EBA manifest

The Telegram (EBA) manifest was missing spec.categories, so it fell
into the uncategorized/protocol bucket. Restore popular + global to
match the legacy telegram adapter.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

src/langbot/pkg/platform/adapters/telegram/manifest.yaml

@@ -12,6 +12,9 @@ metadata:
   icon: telegram.svg
 
 spec:
+  categories:
+    - popular
+    - global
   config:
     - name: token
       label: