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

web/src/components/common/Container.tsx

@@ -5,16 +5,16 @@ interface ContainerProps {
   className?: string
   as?: 'div' | 'main' | 'header' | 'section'
   style?: CSSProperties
-  /** 是否充满宽度（取消 max-width） */
+  /** Whether to fill the full width (removes max-width) */
   fluid?: boolean
-  /** 是否取消水平内边距 */
+  /** Whether to remove horizontal padding */
   noPadding?: boolean
-  /** 自定义最大宽度类（默认 max-w-[1920px]） */
+  /** Custom max-width class (default max-w-[1920px]) */
   maxWidthClass?: string
 }
 
 /**
- * 统一的容器组件，确保所有页面元素使用一致的最大宽度和内边距
+ * Unified container component that ensures all page elements use a consistent max width and padding
  * - max-width: 1920px
  * - padding: 24px (mobile) -> 32px (tablet) -> 48px (desktop)
  */