Replace void returns with { success: true } across all API endpoints

- Add successResponseSchema to common.ts for explicit success responses
- Update all auth, me, orgs, and admin procedures to return { success: true }
- Update contract.ts to use successResponseSchema instead of z.void()
- Add ast-grep rule to prevent future z.void() usage in contracts
- Add build:packages script to root package.json
- Fix test file lint errors with eslint-disable comments

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

apps/api-server/src/procedures/orgs/management.ts

@@ -39,6 +39,8 @@ export const orgsUpdate = os.orgs.update
       .set(updates)
       .where("id", "=", org.id)
       .execute();
+
+    return { success: true };
   });
 
 /**
@@ -57,6 +59,8 @@ export const orgsDelete = os.orgs.delete
     requireRole(membership, "owner");
 
     await context.db.deleteFrom("orgs").where("id", "=", org.id).execute();
+
+    return { success: true };
   });
 
 /**
@@ -92,4 +96,6 @@ export const orgsLeave = os.orgs.leave
         .where("user_id", "=", context.user.id)
         .execute();
     });
+
+    return { success: true };
   });