feat(business): wire BusinessIssue island to live PHP backend

Render the DB-driven BusinessIssue island on the Business page and let
the Playwright config target a remote BASE_URL for live verification.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

playwright.config.ts

@@ -1,15 +1,20 @@
 import { defineConfig, devices } from "@playwright/test";
 
+const baseURL = process.env.BASE_URL ?? "http://localhost:4321";
+const isRemote = Boolean(process.env.BASE_URL);
+
 export default defineConfig({
   testDir: "./tests",
   timeout: 15_000,
-  use: { baseURL: "http://localhost:4321" },
-  webServer: {
-    command: "npm run preview",
-    url: "http://localhost:4321",
-    reuseExistingServer: true,
-    timeout: 30_000,
-  },
+  use: { baseURL },
+  webServer: isRemote
+    ? undefined
+    : {
+        command: "npm run preview",
+        url: "http://localhost:4321",
+        reuseExistingServer: true,
+        timeout: 30_000,
+      },
   projects: [
     { name: "desktop", use: { ...devices["Desktop Chrome"] } },
     { name: "mobile", use: { ...devices["Pixel 5"] } },