feat(web): refactor MCP servers as sidebar entities and improve sidebar footer

- Refactor MCP servers to be managed as collapsible sidebar sub-items with
  ?id= detail routing and inline form (matching bots/pipelines pattern)
- Add MCPDetailContent with create/edit modes, enable toggle, and danger zone
- Extract MCPForm as standalone inline form from MCPFormDialog
- Move API Integration to standalone sidebar footer button
- Add GitHub star CTA with live star count badge in user dropdown menu
- Add MCP server status dot indicators in sidebar (green/gray for enabled/disabled)
- Add i18n keys for MCP detail page and GitHub star CTA in all 4 locales

web/src/i18n/locales/en-US.ts

@@ -29,6 +29,7 @@ const enUS = {
     language: 'Language',
     helpDocs: 'Get Help',
     featureRequest: 'Feature Request',
+    starOnGitHub: 'Star on GitHub',
     create: 'Create',
     edit: 'Edit',
     delete: 'Delete',
@@ -612,6 +613,13 @@ const enUS = {
     sseTimeoutNonNegative: 'SSE timeout cannot be negative',
     updateSuccess: 'Updated successfully',
     updateFailed: 'Update failed: ',
+    selectFromSidebar: 'Select an MCP server from the sidebar',
+    dangerZone: 'Danger Zone',
+    dangerZoneDescription:
+      'Irreversible and destructive actions for this MCP server.',
+    deleteMCPAction: 'Delete this MCP server',
+    deleteMCPHint:
+      'Once deleted, this MCP server configuration cannot be recovered.',
   },
   pipelines: {
     title: 'Pipelines',