refactor(test): update test expectations for removed submit route

- Comment out submit route assertions in main_test.go and server_test.go

- Comment out TestTask_OldAPICompatibility in task_test.go

- Update expected route count 31→30 in testenv env_test.go

Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-openagent)

Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>

cmd/server/main_test.go

@@ -68,7 +68,7 @@ func TestRouterRegistration(t *testing.T) {
 		{"GET", "/api/v1/applications/:id"},
 		{"PUT", "/api/v1/applications/:id"},
 		{"DELETE", "/api/v1/applications/:id"},
-		{"POST", "/api/v1/applications/:id/submit"},
+		// {"POST", "/api/v1/applications/:id/submit"}, // [已禁用] 已被 POST /tasks 取代
 	}
 
 	routeMap := map[string]bool{}