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/vite.config.ts

@@ -0,0 +1,21 @@
+import { defineConfig } from 'vite'
+import { svelte } from '@sveltejs/vite-plugin-svelte'
+import sveltePreprocess from 'svelte-preprocess'
+import { readFileSync } from 'fs'
+
+const pkg = JSON.parse(readFileSync('./package.json', 'utf-8'))
+
+export default defineConfig({
+  plugins: [
+    svelte({
+      preprocess: sveltePreprocess({ typescript: true })
+    })
+  ],
+  define: {
+    __APP_VERSION__: JSON.stringify(pkg.version),
+  },
+  server: {
+    port: 5187,
+    open: true,
+  }
+})