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/manager.go

@@ -45,7 +45,7 @@ func (m *Manager) Run(chatID int64, userMessage string, onChunk func(string)) st
 	case lane <- struct{}{}:
 	case <-time.After(60 * time.Second):
 		logger.Warnf("Agent: lane wait timeout for chat %d — previous message still processing", chatID)
-		return "Previous message is still being processed. Please wait a moment and try again. / 上一条消息仍在处理中，请稍等片刻后再试。"
+		return "Previous message is still being processed. Please wait a moment and try again."
 	}
 	defer func() { <-lane }()
 	return a.Run(userMessage, onChunk)