feat: cream terminal redesign, English-only UI, autopilot launch fixes

- Redesign dashboard into a cream-paper + vermilion IBM Plex Mono terminal
  (live L2 order book, cost/liq map, WS K-line, signal matrix, orchestration
  topology, risk radar, execution log, current positions, equity curve)
- Convert all user-facing UI and backend strings/prompts from Chinese to
  English (multi-language retained, default English)
- Add /api/statistics/full endpoint + full-stats frontend wiring
- Fix Autopilot launch: reuse the existing trader instead of creating
  duplicates (eliminates repeat ~35s create cost and stale-trader 404s);
  launch sends 5m scan interval
- Fix unreadable toasts: cream theme with high-contrast text + per-type accent
- Silence background dashboard polls (getTraderConfig) to stop error-toast spam

telegram/agent/agent.go

@@ -273,7 +273,7 @@ func (a *Agent) Run(userMessage string, onChunk func(string)) string {
 
 	// Safety: max iterations reached.
 	logger.Warnf("Agent: max iterations (%d) reached for message: %q", maxIterations, userMessage)
-	reply := "Operation completed. Please check your account for the latest status. / 操作已完成，请检查您的账户查看最新状态。"
+	reply := "Operation completed. Please check your account for the latest status."
 	a.memory.Add("user", userMessage)
 	a.memory.Add("assistant", reply)
 	return reply