test(proxy): update the CORS policy assertion to the served method list

`proxy.test.ts` pinned the previous hand-written method string, so widening
`resolveApiCorsPolicy` to advertise PATCH and HEAD left it asserting a list the
middleware no longer returns. The literal is kept rather than imported from
`proxy.ts` so the test still pins the exact wire value independently of the
implementation.

Author: waleedlatif1

apps/sim/proxy.test.ts

@@ -127,7 +127,7 @@ describe('resolveApiCorsPolicy', () => {
     expect(policy).toEqual({
       origin: 'https://app.sim.test',
       credentials: true,
-      methods: 'GET,POST,OPTIONS,PUT,DELETE',
+      methods: 'GET,HEAD,POST,PUT,PATCH,DELETE,OPTIONS',
       headers: expect.stringContaining('Authorization'),
     })
   })