fix: export ActivityType as value not just type

Changed the activity.types export from 'export type *' to 'export *'
so that the ActivityType enum can be used as both a type and a value.

This is necessary because:
- Backend needs ActivityType.suggestion, ActivityType.like, etc. as values
- Frontend needs ActivityType enum for switch statements
- TypeScript enums need to be exported as values to be used at runtime

shared-types/src/index.ts

@@ -5,7 +5,7 @@
  */
 export * from "./lib/achievement.constants";
 export * from "./lib/achievement.types";
-export type * from "./lib/activity.types";
+export * from "./lib/activity.types";
 export type * from "./lib/art.types";
 export * from "./lib/audit.types";
 export * from "./lib/auth.types";