feat: Cameleer3 design system — complete standalone implementation

Wires up all 5 routes in App.tsx (/, /metrics, /routes/:id,
/exchanges/:id, /agents). Fixes pre-existing build errors: vite.config.ts
now uses vitest/config defineConfig so the test property is typed
correctly; removes unused imports in Collapsible.tsx and _chart-utils.ts;
removes unused parameter in metrics.ts generateTimeSeries.

Build: tsc -b && vite build passes clean. Test suite: 72/72 pass.
Bundle: 334kB JS (101kB gzip) + 54kB CSS (10kB gzip).

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

vite.config.ts

@@ -1,4 +1,4 @@
-import { defineConfig } from 'vite'
+import { defineConfig } from 'vitest/config'
 import react from '@vitejs/plugin-react'
 
 export default defineConfig({