Ship Composio as a built-in integration and trim Settings

- Resolve the API key from cred.txt at the project root in development
  and the packaged resources directory in production; the file is the
  source of truth, so a rotated key replaces the stored one. Fixes the
  401 packaged builds hit when a stale database key won.
- Remove the user-facing Composio key editor; the key ships with the
  product and is not configurable.
- Remove the Migration console from Settings.
- Remove the Connectors and Home refresh buttons; connector statuses
  sync when the page opens.

src/shared/commands/composio.ts

@@ -1,9 +1,3 @@
-export interface SaveComposioSettingsInput {
-  orgId: string;
-  apiKey: string;
-  toolkits: string[];
-}
-
 export interface ComposioToolkitSummaryDto {
   slug: string;
   name: string;