fix: restore API response formats + ai-ui-control ws + profile fields

- Restore {plugins: [...], total: N} for /plugins and /plugins/active-manifests
  (flat array broke frontend PluginRegistry → no menu items → empty UI)
- Restore {count: N} for /notifications/unread-count
  (scalar broke frontend notification badge)
- Fix ai_ui_control: on_install → on_activate for WS manager registration
  (WS 403 on every reconnect after container restart)
- Fix double /api/v1 prefix in useAIContext.ts and SuggestionBadge.tsx
- Add first_name, last_name, avatar_url to User model + migration 0032
- Extend UserUpdate schema with profile + password change fields
- Extend user_service.update_user with profile fields + password change
- Extend frontend UserResponse/UserUpdate types

app/models/user.py

@@ -25,6 +25,9 @@ class User(Base, TenantMixin):
     )
     email: Mapped[str] = mapped_column(String(255), nullable=False, index=True)
     name: Mapped[str] = mapped_column(String(200), nullable=False)
+    first_name: Mapped[str | None] = mapped_column(String(100), nullable=True)
+    last_name: Mapped[str | None] = mapped_column(String(100), nullable=True)
+    avatar_url: Mapped[str | None] = mapped_column(String(500), nullable=True)
     password_hash: Mapped[str] = mapped_column(String(255), nullable=False)
     role: Mapped[str] = mapped_column(String(50), nullable=False, default="viewer")
     role_id: Mapped[uuid.UUID | None] = mapped_column(