Wire connector-definitions/ subdir with index barrel (N9)

32dfa89 renamed the three catalog data files into src/main/connector-definitions/ but left src/main/connector-definitions.ts pointing at the old connector-definitions-data-* paths, which no longer resolve. Fix the barrel to import from ./connector-definitions/index and correct each moved file's ConnectorDefinition import to walk up one level (../connector-definitions).

src/main/connector-definitions/oauth.ts

@@ -13,7 +13,7 @@
  * `getOAuthProvider`.
  */
 
-import type { ConnectorDefinition } from "./connector-definitions";
+import type { ConnectorDefinition } from "../connector-definitions";
 
 export const OAUTH_CONNECTORS: ConnectorDefinition[] = [
   {