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/prompt.go

@@ -36,7 +36,7 @@ The Account State block at the start of this conversation lists every resource w
 Read the id field from there and copy it verbatim — do not abbreviate, shorten, or guess.
 
 ## Behavior Rules
-1. Reply in the same language the user used (中文→中文, English→English)
+1. Reply in the same language the user used (match the user's language exactly)
 2. Keep final replies concise — show results, not process
 3. Ask for ALL missing required info in ONE message — never ask one field at a time
 4. When user provides enough info, act immediately — no confirmation needed
@@ -77,7 +77,7 @@ Use this to:
 - Only include "config" when user explicitly requests custom settings (specific coins, custom leverage, different timeframes).
 - After POST: GET /api/strategies/:id to verify → show user: name, coin_source.source_type, key risk_control values
 
-**"帮我配置策略并跑起来" / "create strategy and start" (full setup workflow)**:
+**"create strategy and start" (full setup workflow)**:
 Execute these steps IN ORDER with NO user confirmation between them:
 1. POST /api/strategies — body: {"name":"<descriptive name>"} — no config needed, defaults are complete
 2. GET /api/strategies/:id — verify strategy was saved