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>

internal/testutil/testenv/env_test.go

@@ -64,7 +64,7 @@ func TestAllRoutesRegistered(t *testing.T) {
 		{"GET", "/api/v1/applications/1"},
 		{"PUT", "/api/v1/applications/1"},
 		{"DELETE", "/api/v1/applications/1"},
-		{"POST", "/api/v1/applications/1/submit"},
+		// {"POST", "/api/v1/applications/1/submit"}, // [已禁用] 已被 POST /tasks 取代
 		{"POST", "/api/v1/files/uploads"},
 		{"GET", "/api/v1/files/uploads/1"},
 		{"PUT", "/api/v1/files/uploads/1/chunks/0"},
@@ -82,7 +82,7 @@ func TestAllRoutesRegistered(t *testing.T) {
 		{"GET", "/api/v1/tasks"},
 	}
 
-	if len(routes) != 31 {
+	if len(routes) != 30 {
 		t.Fatalf("expected 31 routes, got %d", len(routes))
 	}