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.

src/app/app.e2e.ts

@@ -29,7 +29,7 @@ test("renders the migrated WebGIS workbench shell", async ({ page }) => {
     TJWATER_MAP_URL: expect.any(String),
     TJWATER_GEOSERVER_WORKSPACE: expect.any(String),
     TJWATER_SERVER_API_BASE_URL: expect.any(String),
-    TJWATER_AGENT_API_BASE_URL: expect.any(String)
+    TJWATER_AGENT_URL: expect.any(String)
   });
   expect(Object.keys(runtimeConfig as Record<string, unknown>)).not.toContainEqual(
     expect.stringMatching(/^(NEXT_PUBLIC_|VITE_)/)
@@ -49,7 +49,7 @@ test("animates the compact header menu without overflowing", async ({ page }) =>
   await page.setViewportSize({ width: 375, height: 812 });
   await page.goto("/");
 
-  await page.locator('button[aria-label^="查看异常处置面板"]:visible').click();
+  await page.locator('button[aria-label^="查看待办与告警"]:visible').click();
 
   const menu = page.locator('[role="menu"][data-state="open"]');
   await expect(menu).toBeVisible();