feat: initial commit - EvoTraders project

量化交易多智能体系统，包含：
- 分析师、投资组合经理、风险经理等智能体
- 股票分析、投资组合管理、风险控制工具
- React 前端界面
- FastAPI 后端服务

Co-Authored-By: Claude <noreply@anthropic.com>

frontend/src/utils/formatters.js

@@ -0,0 +1,85 @@
+/**
+ * Formatting utility functions
+ */
+
+/**
+ * Format time from timestamp
+ */
+export function formatTime(ts) {
+  try {
+    const d = new Date(ts);
+    return d.toLocaleString([], {
+      month: "2-digit",
+      day: "2-digit",
+      hour: "2-digit",
+      minute: "2-digit"
+    });
+  } catch {
+    return "";
+  }
+}
+
+/**
+ * Format date and time from timestamp
+ */
+export function formatDateTime(ts) {
+  try {
+    const d = new Date(ts);
+    const date = d.toLocaleDateString("en-US", { month: "short", day: "numeric" });
+    const time = d.toLocaleTimeString("en-US", { hour: "2-digit", minute: "2-digit", hour12: false });
+    return `${date} ${time}`;
+  } catch {
+    return "";
+  }
+}
+
+/**
+ * Format number with commas (no decimals)
+ */
+export function formatNumber(num) {
+  if (!isFinite(num)) {
+    return "-";
+  }
+  return Math.abs(num).toLocaleString(undefined, { maximumFractionDigits: 0 });
+}
+
+/**
+ * Format full number with commas for Y-axis
+ */
+export function formatFullNumber(num) {
+  if (!isFinite(num)) {
+    return "-";
+  }
+  return num.toLocaleString(undefined, { maximumFractionDigits: 0 });
+}
+
+/**
+ * Format ticker price with appropriate decimal places
+ */
+export function formatTickerPrice(price) {
+  if (!isFinite(price)) {
+    return "-";
+  }
+  if (price >= 1000) {
+    return price.toLocaleString(undefined, { minimumFractionDigits: 2, maximumFractionDigits: 2 });
+  } else if (price >= 1) {
+    return price.toFixed(2);
+  } else {
+    return price.toFixed(4);
+  }
+}
+
+/**
+ * Calculate duration between two timestamps
+ */
+export function calculateDuration(start, end) {
+  const diff = end - start;
+  const minutes = Math.floor(diff / 60000);
+  if (minutes < 60) {
+    return `${minutes}m`;
+  }
+  const hours = Math.floor(minutes / 60);
+  const mins = minutes % 60;
+  return `${hours}h ${mins}m`;
+}
+