feat(bid): 新增投标报表统计分析模块

本次提交新增了完整的投标报表统计分析功能，包括：

添加用于数据检查与菜单初始化的 SQL 脚本

实现采购概览仪表板、采购成本分析及供应商绩效报告的后端服务、Mapper、Controller 及 VO 类

添加前端 API、路由配置以及使用 ECharts 可视化图表的页面组件

为仪表板添加通用的 KPI 卡片组件

ruoyi-ui/src/views/bid/report/components/KpiCard.vue

@@ -0,0 +1,104 @@
+<template>
+  <el-card shadow="hover" class="kpi-card" :style="{ '--kpi-accent': accentColor }">
+    <div class="kpi-label">{{ label }}</div>
+    <div class="kpi-value">
+      <span class="kpi-number">{{ displayValue }}</span>
+      <span class="kpi-unit" v-if="unit">{{ unit }}</span>
+    </div>
+    <div class="kpi-trend" :class="trendClass" v-if="changeRate > 0">
+      <i :class="trendIcon"></i>
+      {{ changeRateText }}
+      <span class="trend-label">环比上月</span>
+    </div>
+    <div class="kpi-trend no-change" v-else>
+      <i class="el-icon-minus"></i> 持平
+    </div>
+  </el-card>
+</template>
+
+<script>
+const COLORS = ['#409EFF', '#67C23A', '#E6A23C', '#F56C6C', '#909399']
+const CARD_NAMES = ['采购总额', 'RFQ总数', '采购单数', '活跃供应商']
+
+export default {
+  name: 'KpiCard',
+  props: {
+    label: { type: String, required: true },
+    value: { type: [Number, String], default: 0 },
+    unit: { type: String, default: '' },
+    changeRate: { type: Number, default: 0 },
+    trend: { type: String, default: 'up' }
+  },
+  computed: {
+    safeValue() {
+      const v = Number(this.value)
+      return isNaN(v) ? 0 : v
+    },
+    displayValue() {
+      const v = this.safeValue
+      if (this.label === '采购总额') {
+        if (v >= 100000000) return '¥' + (v / 100000000).toFixed(2) + '亿'
+        if (v >= 10000) return '¥' + (v / 10000).toFixed(2) + '万'
+        return '¥' + v.toLocaleString()
+      }
+      return v.toLocaleString()
+    },
+    trendClass() { return this.trend === 'up' ? 'trend-up' : 'trend-down' },
+    trendIcon() { return this.trend === 'up' ? 'el-icon-top' : 'el-icon-bottom' },
+    changeRateText() {
+      const rate = Number(this.changeRate) || 0
+      return rate.toFixed(1) + '%'
+    },
+    accentColor() {
+      const idx = CARD_NAMES.indexOf(this.label)
+      return COLORS[idx >= 0 ? idx : 4]
+    }
+  }
+}
+</script>
+
+<style scoped>
+.kpi-card {
+  border-left: 4px solid var(--kpi-accent, #409EFF);
+  border-radius: 6px;
+  transition: transform .2s;
+}
+.kpi-card:hover {
+  transform: translateY(-2px);
+}
+.kpi-label {
+  font-size: 14px;
+  color: #909399;
+  margin-bottom: 8px;
+}
+.kpi-value {
+  margin-bottom: 8px;
+  display: flex;
+  align-items: baseline;
+}
+.kpi-number {
+  font-size: 28px;
+  font-weight: 700;
+  color: #303133;
+  line-height: 1.2;
+}
+.kpi-unit {
+  font-size: 14px;
+  color: #909399;
+  margin-left: 4px;
+}
+.kpi-trend {
+  font-size: 13px;
+  display: flex;
+  align-items: center;
+  gap: 4px;
+}
+.trend-up { color: #67C23A; }
+.trend-down { color: #F56C6C; }
+.no-change { color: #C0C4CC; }
+.trend-label {
+  color: #C0C4CC;
+  margin-left: 4px;
+  font-size: 12px;
+}
+</style>