feat: 添加业务分析后端接口

新增 AnalysisController 提供 6 个分析接口：
- /admin/analysis/profit - 盈利分析（交易手续费/充提手续费/资金利差）
- /admin/analysis/cash-flow - 资金流动趋势（按月统计充值/提现/净流入）
- /admin/analysis/trade - 交易分析（买入/卖出统计+趋势）
- /admin/analysis/coin-distribution - 币种交易分布
- /admin/analysis/user-growth - 用户增长分析（新增/活跃用户）
- /admin/analysis/risk - 风险指标（大额交易/异常提现/KYC/冻结账户）
- /admin/analysis/health - 综合健康度评分

更新 Mapper 添加分析查询方法：
- OrderFundMapper: 手续费统计、时间范围查询、大额交易、异常提现
- OrderTradeMapper: 交易金额统计、活跃用户、币种分布

前端 API 对接：
- 新增 6 个分析相关 Query hooks
- 更新 analytics.vue 使用真实数据
- 动态决策建议基于实际数据

flutter_monisuo/lib/ui/components/trade_button.dart

@@ -0,0 +1,125 @@
+import 'package:flutter/material.dart';
+import 'package:shadcn_ui/shadcn_ui.dart';
+
+/// 交易按钮组件 - 买入/卖出按钮
+class TradeButton extends StatelessWidget {
+  final bool isBuy;
+  final String? coinCode;
+  final VoidCallback? onPressed;
+  final bool isLoading;
+  final bool fullWidth;
+
+  // 颜色常量
+  static const buyColor = Color(0xFF00C853);
+  static const sellColor = Color(0xFFFF5252);
+
+  const TradeButton({
+    super.key,
+    this.isBuy = true,
+    this.coinCode,
+    this.onPressed,
+    this.isLoading = false,
+    this.fullWidth = false,
+  });
+
+  /// 买入按钮
+  const TradeButton.buy({
+    super.key,
+    this.coinCode,
+    this.onPressed,
+    this.isLoading = false,
+    this.fullWidth = false,
+  }) : isBuy = true;
+
+  /// 卖出按钮
+  const TradeButton.sell({
+    super.key,
+    this.coinCode,
+    this.onPressed,
+    this.isLoading = false,
+    this.fullWidth = false,
+  }) : isBuy = false;
+
+  @override
+  Widget build(BuildContext context) {
+    final color = isBuy ? buyColor : sellColor;
+    final text = isBuy ? '买入${coinCode != null ? ' $coinCode' : ''}' : '卖出${coinCode != null ? ' $coinCode' : ''}';
+    final icon = isBuy ? LucideIcons.arrowDownToLine : LucideIcons.arrowUpFromLine;
+
+    final button = ShadButton(
+      backgroundColor: color,
+      onPressed: isLoading ? null : onPressed,
+      child: Row(
+        mainAxisSize: fullWidth ? MainAxisSize.max : MainAxisSize.min,
+        mainAxisAlignment: MainAxisAlignment.center,
+        children: [
+          if (isLoading)
+            const SizedBox.square(
+              dimension: 16,
+              child: CircularProgressIndicator(
+                strokeWidth: 2,
+                color: Colors.white,
+              ),
+            )
+          else
+            Icon(icon, size: 18, color: Colors.white),
+          const SizedBox(width: 8),
+          Text(
+            text,
+            style: const TextStyle(
+              color: Colors.white,
+              fontSize: 16,
+              fontWeight: FontWeight.w600,
+            ),
+          ),
+        ],
+      ),
+    );
+
+    if (fullWidth) {
+      return SizedBox(width: double.infinity, child: button);
+    }
+    return button;
+  }
+}
+
+/// 交易按钮组 - 同时显示买入和卖出按钮
+class TradeButtonGroup extends StatelessWidget {
+  final String? coinCode;
+  final VoidCallback? onBuyPressed;
+  final VoidCallback? onSellPressed;
+  final bool isBuyLoading;
+  final bool isSellLoading;
+
+  const TradeButtonGroup({
+    super.key,
+    this.coinCode,
+    this.onBuyPressed,
+    this.onSellPressed,
+    this.isBuyLoading = false,
+    this.isSellLoading = false,
+  });
+
+  @override
+  Widget build(BuildContext context) {
+    return Row(
+      children: [
+        Expanded(
+          child: TradeButton.buy(
+            coinCode: coinCode,
+            onPressed: onBuyPressed,
+            isLoading: isBuyLoading,
+          ),
+        ),
+        const SizedBox(width: 12),
+        Expanded(
+          child: TradeButton.sell(
+            coinCode: coinCode,
+            onPressed: onSellPressed,
+            isLoading: isSellLoading,
+          ),
+        ),
+      ],
+    );
+  }
+}