feat(settings): support gateway source switching

tests/test_product_suite_gui.py

@@ -153,6 +153,41 @@ class ProductSuiteGuiTests(TempDirMixin, unittest.TestCase):
             path=db_path,
         )
 
+    def test_direct_gateway_blocks_new_suite_actions_but_keeps_default_job_resume_available(self):
+        with self.make_temp_dir() as temp_dir:
+            config = self._config(temp_dir)
+            config["ai"] = appconfig.ai_config(config)
+            config["ai"]["backend"] = "direct"
+            project, assets = self._create_project_with_assets(temp_dir, config, 1)
+            job = image_studio.create_job(
+                project.id,
+                source_asset_id=assets[0].id,
+                job_type="白底图",
+                prompt="已提交图片",
+                generation_source="cmhub",
+                provider="cmhub",
+                path=config["db_path"],
+            )
+            image_studio.set_job_submitted(job.id, "cmhub-task-1", path=config["db_path"])
+
+            tab = ProductSuiteTab(config=config, db_path=config["db_path"])
+            self.addCleanup(tab.close)
+            state = tab._displayed_state
+            state.account_alias = "alias-a"
+            state.item_id = project.item_id
+            state.project_id = project.id
+            state.project_binding_state = project.binding_state
+            tab._load_state(state)
+            tab.refresh_gateway_state()
+
+            self.assertFalse(tab.generate_button.isEnabled())
+            self.assertFalse(tab.ai_write_button.isEnabled())
+            self.assertFalse(tab.resume_submitted_button.isHidden())
+            self.assertTrue(tab.resume_submitted_button.isEnabled())
+            self.assertIn("仅支持默认网关", tab.generate_button.toolTip())
+
+        self.assert_removed(temp_dir)
+
     def test_tab_builds_suite_controls_without_old_detail_workspace(self):
         with self.make_temp_dir() as temp_dir:
             config = self._config(temp_dir)