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>

src/mocks/metrics.ts

@@ -25,7 +25,6 @@ function generateTimeSeries(
   baseValue: number,
   variance: number,
   points: number,
-  startHour = 6,
 ): TimeSeriesPoint[] {
   const result: TimeSeriesPoint[] = []
   const now = new Date('2026-03-18T09:15:00')