feat(agent): support Responses steering and project-aware tools

Use the dedicated TJWATER_AGENT_URL and Responses stream protocol. Keep running
turns active while users steer or queue follow-ups and edit pending delivery.
Refresh the model catalog before generation and preserve approval mode selection.

Integrate scoped investigation messaging/presentation, geographic place selection,
current Agent composer styles and supporting workbench contracts.

Validation: 77 focused Vitest checks, 21 browser cases, lint, typecheck and
production build. Preserve direct Server/Agent routing and project authentication.

tests/browser/non-map-panels-layout.e2e.ts

@@ -173,6 +173,7 @@ test("assigned desktop panels avoid native form controls and horizontal overflow
   const devPanel = page.getByRole("complementary", { name: "地图开发面板" });
   await expectContained(devPanel, 1280);
   await expect(devPanel.locator("select")).toHaveCount(0);
+  await devPanel.locator("summary").filter({ hasText: "图层样式" }).click();
   const layerGroup = devPanel.getByRole("combobox", { name: "业务图层组" });
   await layerGroup.focus();
   await layerGroup.press("Enter");
@@ -199,18 +200,9 @@ for (const width of [375, 320]) {
     await page.getByRole("button", { name: "打开 Agent 面板" }).click();
     const agentSheet = page.getByRole("region", { name: "Agent 工作台抽屉" });
     await expectContained(agentSheet, width);
-    const welcomeTitle = agentSheet.getByRole("heading", { name: "我已就绪，请描述任务" });
-    await expect(welcomeTitle).toBeVisible();
-    const [welcomeBox, conversationBox] = await Promise.all([
-      welcomeTitle.boundingBox(),
-      agentSheet.getByRole("log").boundingBox()
-    ]);
-    expect(welcomeBox).not.toBeNull();
-    expect(conversationBox).not.toBeNull();
-    expect(welcomeBox!.y).toBeGreaterThanOrEqual(conversationBox!.y);
-    expect(welcomeBox!.y + welcomeBox!.height).toBeLessThanOrEqual(
-      conversationBox!.y + conversationBox!.height
-    );
+    await expect(agentSheet.getByRole("heading", { name: "我已就绪，请描述任务" })).toHaveCount(0);
+    await expect(agentSheet.getByRole("log")).toBeVisible();
+    await expect(agentSheet.getByRole("textbox")).toBeVisible();
     await expect(page.locator("[data-sonner-toast]")).toHaveCount(0, { timeout: 15_000 });
     await page.screenshot({
       path: `test-results/non-map-panels/${width}-agent.png`,
@@ -364,7 +356,7 @@ async function prepareWorkbench(page: Page) {
         TJWATER_MAP_URL: "https://non-map-panels.invalid/geoserver",
         TJWATER_GEOSERVER_WORKSPACE: "tjwater_next",
         TJWATER_SERVER_API_BASE_URL: "https://tjwater-api.invalid",
-        TJWATER_AGENT_API_BASE_URL: "http://127.0.0.1:8787",
+        TJWATER_AGENT_URL: "http://127.0.0.1:8787",
         TJWATER_ENABLE_DEV_PANEL: "true",
         TJWATER_ENABLE_MSW: "false"
       })}`