fix: 修复微信账单金额解析问题（半角¥符号支持）

- 修复 parse_amount 函数同时支持全角￥和半角¥
- 新增 MonthRangePicker 日期选择组件
- 新增 /api/monthly-stats 接口获取月度统计
- 分析页面月度趋势使用全量数据
- 新增健康检查路由

web/src/routes/analysis/+page.svelte

@@ -1,11 +1,10 @@
 <script lang="ts">
   import { onMount } from 'svelte';
-  import { fetchBills, checkHealth, type CleanedBill } from '$lib/api';
+  import { fetchBills, fetchMonthlyStats, checkHealth, type CleanedBill, type MonthlyStat } from '$lib/api';
   import { Button } from '$lib/components/ui/button';
   import { Badge } from '$lib/components/ui/badge';
   import * as Card from '$lib/components/ui/card';
-  import { DateRangePicker } from '$lib/components/ui/date-range-picker';
-  import { formatLocalDate } from '$lib/utils';
+  import { MonthRangePicker } from '$lib/components/ui/month-range-picker';
   import BarChart3 from '@lucide/svelte/icons/bar-chart-3';
   import Loader2 from '@lucide/svelte/icons/loader-2';
   import AlertCircle from '@lucide/svelte/icons/alert-circle';
@@ -25,7 +24,6 @@
   // 数据处理服务
   import { 
     calculateCategoryStats, 
-    calculateMonthlyStats, 
     calculateDailyExpenseData, 
     calculateTotalStats,
     calculatePieChartData,
@@ -37,15 +35,17 @@
   // 分类数据
   import { categories as allCategories } from '$lib/data/categories';
 
-  // 计算默认日期范围（本月）
+  // 计算默认日期范围（本月1日到今天）
   function getDefaultDates() {
     const today = new Date();
-    const year = today.getFullYear();
-    const month = today.getMonth();
-    
-    const startDate = formatLocalDate(new Date(year, month, 1));
-    const endDate = formatLocalDate(today);
-    return { startDate, endDate };
+    return {
+      startYear: today.getFullYear(),
+      startMonth: today.getMonth() + 1,
+      startDay: 1,
+      endYear: today.getFullYear(),
+      endMonth: today.getMonth() + 1,
+      endDay: today.getDate(),
+    };
   }
   const defaultDates = getDefaultDates();
 
@@ -53,12 +53,22 @@
   let isLoading = $state(false);
   let errorMessage = $state('');
   let records: CleanedBill[] = $state([]);
+  let monthlyStats: MonthlyStat[] = $state([]); // 月度统计（全部数据）
   let isDemo = $state(false);
   let serverAvailable = $state(true);
   
-  // 时间范围筛选 - 初始化为默认值
-  let startDate: string = $state(defaultDates.startDate);
-  let endDate: string = $state(defaultDates.endDate);
+  // 日期范围筛选 - 初始化为默认值
+  let startYear = $state(defaultDates.startYear);
+  let startMonth = $state(defaultDates.startMonth);
+  let startDay = $state(defaultDates.startDay);
+  let endYear = $state(defaultDates.endYear);
+  let endMonth = $state(defaultDates.endMonth);
+  let endDay = $state(defaultDates.endDay);
+  
+  // 辅助函数：将年月日转换为日期字符串
+  function toDateString(year: number, month: number, day: number): string {
+    return `${year}-${String(month).padStart(2, '0')}-${String(day).padStart(2, '0')}`;
+  }
   
   // 将 CleanedBill 转换为分析服务需要的格式
   function toAnalysisRecords(bills: CleanedBill[]) {
@@ -79,7 +89,6 @@
   // 派生分析数据
   let analysisRecords = $derived(isDemo ? demoRecords : toAnalysisRecords(records));
   let categoryStats = $derived(calculateCategoryStats(analysisRecords));
-  let monthlyStats = $derived(calculateMonthlyStats(analysisRecords));
   let dailyExpenseData = $derived(calculateDailyExpenseData(analysisRecords));
   let totalStats = $derived(calculateTotalStats(analysisRecords));
   let pieChartData = $derived(calculatePieChartData(categoryStats, totalStats.expense));
@@ -113,19 +122,29 @@
         return;
       }
       
-      // 获取账单数据（带时间范围筛选）
-      const response = await fetchBills({ 
-        page_size: 10000,
-        start_date: startDate || undefined,
-        end_date: endDate || undefined,
-      });
-      if (response.result && response.data) {
-        records = response.data.bills || [];
+      // 并行获取数据：筛选后的账单 + 全部月度统计
+      const [billsResponse, monthlyResponse] = await Promise.all([
+        fetchBills({ 
+          page_size: 10000,
+          start_date: toDateString(startYear, startMonth, startDay),
+          end_date: toDateString(endYear, endMonth, endDay),
+        }),
+        fetchMonthlyStats(),
+      ]);
+      
+      // 处理账单数据
+      if (billsResponse.result && billsResponse.data) {
+        records = billsResponse.data.bills || [];
         if (records.length === 0) {
           errorMessage = '暂无账单数据';
         }
       } else {
-        errorMessage = response.message || '加载失败';
+        errorMessage = billsResponse.message || '加载失败';
+      }
+      
+      // 处理月度统计数据
+      if (monthlyResponse.result && monthlyResponse.data) {
+        monthlyStats = monthlyResponse.data;
       }
     } catch (err) {
       errorMessage = err instanceof Error ? err.message : '加载失败';
@@ -135,10 +154,30 @@
     }
   }
   
-  // 日期变化时重新加载
-  function onDateChange() {
+  // 日期变化时重新加载（只加载筛选后的数据，月度统计不变）
+  async function onDateChange() {
     if (!isDemo) {
-      loadData();
+      isLoading = true;
+      errorMessage = '';
+      try {
+        const response = await fetchBills({ 
+          page_size: 10000,
+          start_date: toDateString(startYear, startMonth, startDay),
+          end_date: toDateString(endYear, endMonth, endDay),
+        });
+        if (response.result && response.data) {
+          records = response.data.bills || [];
+          if (records.length === 0) {
+            errorMessage = '暂无账单数据';
+          }
+        } else {
+          errorMessage = response.message || '加载失败';
+        }
+      } catch (err) {
+        errorMessage = err instanceof Error ? err.message : '加载失败';
+      } finally {
+        isLoading = false;
+      }
     }
   }
   
@@ -170,10 +209,14 @@
           📊 示例数据
         </Badge>
       {:else}
-        <!-- 时间范围筛选 -->
-        <DateRangePicker 
-          bind:startDate 
-          bind:endDate 
+        <!-- 日期范围筛选 -->
+        <MonthRangePicker 
+          bind:startYear 
+          bind:startMonth
+          bind:startDay
+          bind:endYear
+          bind:endMonth
+          bind:endDay
           onchange={onDateChange}
         />
       {/if}

web/src/routes/health/+server.ts

@@ -0,0 +1,47 @@
+import { env } from '$env/dynamic/private';
+import type { RequestHandler } from './$types';
+
+// 服务端使用 Docker 内部地址，默认使用 localhost
+const API_URL = env.API_URL || 'http://localhost:8080';
+
+// 获取版本号（优先从环境变量，其次从 package.json）
+function getVersion(): string {
+  // 优先使用环境变量
+  if (process.env.npm_package_version) {
+    return process.env.npm_package_version;
+  }
+  
+  // 回退到默认值
+  return '0.0.1';
+}
+
+const APP_VERSION = getVersion();
+
+export const GET: RequestHandler = async ({ fetch }) => {
+  try {
+    const response = await fetch(`${API_URL}/health`);
+    const data = await response.json();
+
+    return new Response(
+      JSON.stringify({
+        status: data.status || 'ok',
+        version: APP_VERSION,
+      }),
+      {
+        status: response.status,
+        headers: { 'Content-Type': 'application/json' },
+      }
+    );
+  } catch (error) {
+    return new Response(
+      JSON.stringify({
+        status: 'error',
+        version: APP_VERSION,
+      }),
+      {
+        status: 503,
+        headers: { 'Content-Type': 'application/json' },
+      }
+    );
+  }
+};