feat(M08-B): 补任务免清洁

backend/tests/cleaning-route.test.mjs

@@ -94,6 +94,10 @@ const app = await buildApp({
         calls.push(['reject', input]);
         return { ...task('REJECTED'), rejectReason: input.reason };
       },
+      async exempt(input) {
+        calls.push(['exempt', input]);
+        return { ...task('EXEMPT'), rewardCents: 0 };
+      },
       async listMembers(input) {
         calls.push(['listMembers', input]);
         return [member('LEAD', '31', 500), member('ASSIST', '33', 100)];
@@ -410,6 +414,17 @@ assert.equal(reject.statusCode, 200);
 assert.equal(calls.at(-1)[0], 'reject');
 assert.equal(calls.at(-1)[1].reason, 'photo is unclear');
 
+const exempt = await app.inject({
+  method: 'POST',
+  url: '/admin-api/cleaning/tasks/101/exempt',
+  headers: { authorization: `Bearer ${token}` },
+  payload: { note: 'no cleaning required' }
+});
+assert.equal(exempt.statusCode, 200);
+assert.equal(exempt.json().data.status, 'EXEMPT');
+assert.equal(calls.at(-1)[0], 'exempt');
+assert.equal(calls.at(-1)[1].note, 'no cleaning required');
+
 const members = await app.inject({
   method: 'GET',
   url: '/admin-api/cleaning/tasks/101/members',