feat: 详情页K线增加技术指标 MA/MACD/RSI/KDJ

- 新增 indicators.ts 指标计算库：SMA/EMA/MACD(12,26,9)/RSI(14)/KDJ(9,3,3)
- KLineChart 支持指标开关：MA(5/10/20/30) 主图叠加、MACD/RSI/KDJ 独立副图 pane
- 图表高度随指标 pane 数量动态增长（主图 300 + 每个副图 95），主图不被压缩
- 指标全部前端本地计算，无需后端

src/routes/stock.$code.tsx

@@ -87,6 +87,9 @@ function StockDetail() {
   const [dailyTableDays, setDailyTableDays] = useState<number>(7);
   const [chartRange, setChartRange] = useState(90); // 默认近3月
   const [chartMode, setChartMode] = useState<"line" | "candle">("candle"); // 折线/蜡烛，默认蜡烛
+  const [indicators, setIndicators] = useState({ ma: true, macd: true, rsi: false, kdj: false });
+  const toggleIndicator = (key: keyof typeof indicators) =>
+    setIndicators((prev) => ({ ...prev, [key]: !prev[key] }));
   const [loading, setLoading] = useState(true);
   const [error, setError] = useState<string | null>(null);
   const [inCollection, setInCollection] = useState(false);
@@ -542,6 +545,25 @@ function StockDetail() {
                     </button>
                   ))}
                 </div>
+                {/* 指标开关：MA / MACD / RSI / KDJ */}
+                <div className="flex gap-0.5 text-xs border rounded-md overflow-hidden">
+                  {([
+                    { key: "ma", label: "MA" },
+                    { key: "macd", label: "MACD" },
+                    { key: "rsi", label: "RSI" },
+                    { key: "kdj", label: "KDJ" },
+                  ] as const).map((it) => (
+                    <button
+                      key={it.key}
+                      onClick={() => toggleIndicator(it.key)}
+                      className={`px-2.5 py-1 transition-colors ${
+                        indicators[it.key] ? "bg-primary text-primary-foreground" : "text-muted-foreground hover:text-foreground"
+                      }`}
+                    >
+                      {it.label}
+                    </button>
+                  ))}
+                </div>
                 {/* 时间范围：3月 / 6月 / 1年 */}
                 <div className="flex gap-0.5 text-xs border rounded-md overflow-hidden">
                   {[
@@ -588,6 +610,7 @@ function StockDetail() {
               }))}
               mode={chartMode}
               hasAddedDate={inCollection}
+              indicators={indicators}
             />
             </>
             )}