chore: migrate remaining ECharts components to Chart.js

- Migrated 4 components from ECharts to Chart.js:
  * MonthlyExpenseCard.vue (折线图)
  * DailyTrendChart.vue (双系列折线图)
  * ExpenseCategoryCard.vue (环形图)
  * BudgetChartAnalysis.vue (仪表盘 + 多种图表)

- Removed all ECharts imports and environment variable switches
- Unified all charts to use BaseChart.vue component
- Build verified: pnpm build success ✓
- No echarts imports remaining ✓

Refs: openspec/changes/migrate-remaining-echarts-to-chartjs

.doc/test-icon-api.sh

@@ -0,0 +1,52 @@
+#!/bin/bash
+
+# 图标搜索 API 测试脚本
+
+BASE_URL="http://localhost:5071"
+
+echo "=== 图标搜索 API 测试 ==="
+echo ""
+
+# 测试 1: 生成搜索关键字
+echo "1. 测试生成搜索关键字 API"
+echo "请求: POST /api/icons/search-keywords"
+echo '请求体: {"categoryName": "餐饮"}'
+echo ""
+
+KEYWORDS_RESPONSE=$(curl -s -X POST "$BASE_URL/api/icons/search-keywords" \
+  -H "Content-Type: application/json" \
+  -d '{"categoryName": "餐饮"}')
+
+echo "响应: $KEYWORDS_RESPONSE"
+echo ""
+
+# 从响应中提取 keywords (假设使用 jq)
+if command -v jq &> /dev/null; then
+  KEYWORDS=$(echo "$KEYWORDS_RESPONSE" | jq -r '.data.keywords | join(", ")')
+  echo "提取的关键字: $KEYWORDS"
+  
+  # 测试 2: 搜索图标
+  echo ""
+  echo "2. 测试搜索图标 API"
+  echo "请求: POST /api/icons/search"
+  echo '请求体: {"keywords": ["food", "restaurant"]}'
+  echo ""
+  
+  ICONS_RESPONSE=$(curl -s -X POST "$BASE_URL/api/icons/search" \
+    -H "Content-Type: application/json" \
+    -d '{"keywords": ["food", "restaurant"]}')
+  
+  echo "响应: $ICONS_RESPONSE" | jq '.'
+  echo ""
+  
+  ICON_COUNT=$(echo "$ICONS_RESPONSE" | jq '.data | length')
+  echo "找到的图标数量: $ICON_COUNT"
+else
+  echo "提示: 安装 jq 工具可以更好地查看 JSON 响应"
+  echo "      Windows: choco install jq"
+  echo "      macOS:   brew install jq"
+  echo "      Linux:   apt-get install jq / yum install jq"
+fi
+
+echo ""
+echo "=== 测试完成 ==="