feat(aria): add Svelte SPA frontend and threat events API

- frontend/: full aria.bcos.dev SPA (port 5187) with Dashboard, Threat Events,
  and IOC Management views; Phase 2-3 nav items disabled as placeholders
- ThreatEventController: GET /api/aria/events (paginated, severity/device filter)
  and GET /api/aria/stats (total/critical/high/activeIoc counts)
- Deployed to bcos.dev: hiveiq-aria-frontend container + aria.bcos.dev NPM proxy

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

frontend/tsconfig.node.json

@@ -0,0 +1,10 @@
+{
+  "compilerOptions": {
+    "composite": true,
+    "skipLibCheck": true,
+    "module": "ESNext",
+    "moduleResolution": "bundler",
+    "allowSyntheticDefaultImports": true
+  },
+  "include": ["vite.config.ts"]
+}