feat(config): phase 7 — drop /ims basePath, update all hardcoded paths, refresh env spec

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

public/manifest.json

@@ -2,14 +2,14 @@
   "name": "IMS — Incident Management",
   "short_name": "IMS",
   "description": "HSE Incident Management System — Setia Corporation",
-  "start_url": "/ims/report",
-  "scope": "/ims/",
+  "start_url": "/report",
+  "scope": "/",
   "display": "standalone",
   "background_color": "#ffffff",
   "theme_color": "#2563eb",
   "icons": [
     {
-      "src": "/ims/icons/icon.svg",
+      "src": "/icons/icon.svg",
       "sizes": "any",
       "type": "image/svg+xml",
       "purpose": "any maskable"