Inherit the platform contract tests, and extend the shared Renovate preset

PlatformWebContract asserts what this app must do because it is on the platform: an /api
path matching no controller 404s rather than returning the SPA, health is UP, the liveness
and readiness probes exist, and a client-side route forwards to the shell. That first one
shipped broken to six live sites and was found by typing a URL by hand; now it fails a
build instead.

renovate.json is three lines pointing at austin/renovate-config. The rules were copied per
repo, so they matched only by luck and a change was six edits.

Platform 0.1.9.

frontend/package.json

@@ -11,7 +11,7 @@
   "dependencies": {
     "react": "^19.2.7",
     "react-dom": "^19.2.7",
-    "lucide-react": "1.26.0"
+    "lucide-react": "1.25.0"
   },
   "devDependencies": {
     "@tailwindcss/vite": "4.3.3",
@@ -20,7 +20,7 @@
     "@types/react-dom": "^19.2.3",
     "@vitejs/plugin-react": "^6.0.3",
     "tailwindcss": "4.3.3",
-    "typescript": "^7.0.0",
+    "typescript": "^5.9.0",
     "vite": "^8.1.3"
   }
 }