feat(web): K线图库对比 —— TradingView Lightweight Charts 实现 + 双库切换

- 按确认方案「两套实现并存对比」：
  - npm 依赖 lightweight-charts@4.2.3（v3 §21 推荐库）
  - components/StockChart/chartTypes.ts：共享 props 接口
  - CandleChart.tsx（ECharts 版，重构复用共享类型）+ CandleChartLW.tsx
    （Lightweight 版：蜡烛+成交量副刻度+MA+成交实心箭头/未成交信号圆点 markers）
  - StockChart.tsx wrapper；个股页顶部「ECharts / Lightweight」切换（默认 Lightweight）
- /stocks/600519.SH 冒烟 200；tsc --noEmit 通过

frontend/web/pnpm-lock.yaml

@@ -11,6 +11,9 @@ importers:
       echarts:
         specifier: ^5.5.1
         version: 5.6.0
+      lightweight-charts:
+        specifier: ^4.2.3
+        version: 4.2.3
       next:
         specifier: ^15.1.0
         version: 15.5.25(@types/node@22.20.1)(react-dom@19.2.8(react@19.2.8))(react@19.2.8)
@@ -286,6 +289,12 @@ packages:
   echarts@5.6.0:
     resolution: {integrity: sha512-oTbVTsXfKuEhxftHqL5xprgLoc0k7uScAwtryCgWF6hPYFLRwOUHiFmHGCBKP5NPFNkDVopOieyUqYGH8Fa3kA==}
 
+  fancy-canvas@2.1.0:
+    resolution: {integrity: sha512-nifxXJ95JNLFR2NgRV4/MxVP45G9909wJTEKz5fg/TZS20JJZA6hfgRVh/bC9bwl2zBtBNcYPjiBE4njQHVBwQ==}
+
+  lightweight-charts@4.2.3:
+    resolution: {integrity: sha512-5kS/2hY3wNYNzhnS8Gb+GAS07DX8GPF2YVDnd2NMC85gJVQ6RLU6YrXNgNJ6eg0AnWPwCnvaGtYmGky3HiLQEw==}
+
   nanoid@3.3.18:
     resolution: {integrity: sha512-DTg4MJbGMWkfi6VZFdNt2/caMbQy4Ou+Op/hJQvGEWcnVfoA1QA+xzRKAzw9jD6+GVOOeYr/mIcuDSdug6F6+w==}
     engines: {node: ^10 || ^12 || ^13.7 || ^14 || >=15.0.1}
@@ -549,6 +558,12 @@ snapshots:
       tslib: 2.3.0
       zrender: 5.6.1
 
+  fancy-canvas@2.1.0: {}
+
+  lightweight-charts@4.2.3:
+    dependencies:
+      fancy-canvas: 2.1.0
+
   nanoid@3.3.18: {}
 
   next@15.5.25(@types/node@22.20.1)(react-dom@19.2.8(react@19.2.8))(react@19.2.8):