refactor: 系统优化 - 错误处理、输入验证、无限滚动

主要改进:
- 新增配置管理 (server/config.js)
- 新增日志工具 (server/utils/logger.js)
- 添加全局错误处理中间件，统一错误响应格式
- 添加输入验证和 AppError 错误类
- 重构 db.js 迁移逻辑，代码更清晰
- 前端列表改为无限滚动加载，每页 20 条
- 封装 AppState 状态管理模块

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

public/js/app.js

@@ -1,11 +1,62 @@
+// ============================================
+// 应用状态管理
+// ============================================
 const API = '';
-let token = localStorage.getItem('token');
-let username = localStorage.getItem('username');
-let currentType = 'income';
-let currentCategory = '接单';
-let currentYear = new Date().getFullYear();
-let currentMonth = new Date().getMonth() + 1;
-let currentNav = 'stats';
+
+const AppState = {
+  // 认证状态
+  auth: {
+    token: localStorage.getItem('token'),
+    username: localStorage.getItem('username')
+  },
+
+  // 导航状态
+  nav: {
+    currentType: 'income',
+    currentCategory: '接单',
+    currentYear: new Date().getFullYear(),
+    currentMonth: new Date().getMonth() + 1,
+    currentNav: 'stats'
+  },
+
+  // 状态更新方法
+  setAuth(token, username) {
+    this.auth.token = token;
+    this.auth.username = username;
+    localStorage.setItem('token', token);
+    localStorage.setItem('username', username);
+  },
+
+  clearAuth() {
+    this.auth.token = null;
+    this.auth.username = null;
+    localStorage.removeItem('token');
+    localStorage.removeItem('username');
+  },
+
+  setCategory(type, category) {
+    this.nav.currentType = type;
+    this.nav.currentCategory = category;
+  },
+
+  setYearMonth(year, month) {
+    this.nav.currentYear = year;
+    this.nav.currentMonth = month;
+  },
+
+  setNav(nav) {
+    this.nav.currentNav = nav;
+  }
+};
+
+// 兼容旧代码的全局变量
+let token = AppState.auth.token;
+let username = AppState.auth.username;
+let currentType = AppState.nav.currentType;
+let currentCategory = AppState.nav.currentCategory;
+let currentYear = AppState.nav.currentYear;
+let currentMonth = AppState.nav.currentMonth;
+let currentNav = AppState.nav.currentNav;
 
 function headers() {
   return { 'Content-Type': 'application/json', 'Authorization': 'Bearer ' + token };

public/js/order-list.js

@@ -1,9 +1,8 @@
 // ============================================
-// 通用列表管理 - 一次性加载
+// 通用列表管理 - 无限滚动加载
 // ============================================
 
-// 通用列表配置
-const listConfig = {
+const config = {
   orderList: { endpoint: '/api/records/orders', emptyMsg: '暂无接单记录', renderItem: renderOrderItem },
   otherIncomeList: { endpoint: '/api/records/other-income', emptyMsg: '暂无红包及其他收入记录', renderItem: renderOtherIncomeItem },
   dispatchList: { endpoint: '/api/records/dispatches', emptyMsg: '暂无派单记录', renderItem: renderDispatchItem },
@@ -11,88 +10,96 @@ const listConfig = {
   milkTeaList: { endpoint: '/api/records/milk-tea', emptyMsg: '暂无奶茶收入记录', renderItem: renderMilkTeaItem }
 };
 
-// 通用列表加载状态（按 listId 存储）
-const listState = {
-  orderList: { loading: false, records: [] },
-  otherIncomeList: { loading: false, records: [] },
-  dispatchList: { loading: false, records: [] },
-  redEnvelopeList: { loading: false, records: [] },
-  milkTeaList: { loading: false, records: [] }
-};
+const PAGE_SIZE = 20;
+
+const listState = {};
 
-// 初始化列表 - 清空状态
 function initList(listId) {
-  const state = listState[listId];
-  if (!state) return;
-
-  state.loading = false;
-  state.records = [];
+  listState[listId] = {
+    loading: false,
+    records: [],
+    page: 1,
+    hasMore: true,
+    totalCount: 0
+  };
 
   const container = document.getElementById(listId);
-  if (container) {
-    container.innerHTML = '';
-  }
+  if (container) container.innerHTML = '';
 }
 
-// 加载列表数据
 async function loadListData(listId) {
-  const config = listConfig[listId];
+  const cfg = config[listId];
   const state = listState[listId];
-  if (!config || !state) return;
+  if (!cfg || !state) return;
 
-  // 防止重复加载
-  if (state.loading) return;
+  if (state.loading || !state.hasMore) return;
 
   state.loading = true;
   showLoading(listId, true);
 
   try {
-    const res = await fetch(API + config.endpoint + '?page=1&limit=1000&year=' + currentYear + '&month=' + currentMonth, { headers: headers() });
+    const res = await fetch(
+      API + cfg.endpoint + '?page=' + state.page + '&limit=' + PAGE_SIZE + '&year=' + currentYear + '&month=' + currentMonth,
+      { headers: headers() }
+    );
 
     if (!res.ok) {
-      console.error(`[loadListData] fetch failed: ${res.status}`);
+      console.error('[loadListData] fetch failed:', res.status);
       state.loading = false;
       showLoading(listId, false);
       return;
     }
 
     const data = await res.json();
+    const newRecords = data.records || [];
+    const total = data.total || 0;
 
-    state.records = data.records || [];
+    state.records = state.records.concat(newRecords);
+    state.totalCount = total;
+    state.hasMore = state.records.length < total;
+    state.page++;
 
     renderList(listId);
+    setupScrollObserver(listId);
   } catch (e) {
-    console.error(`[loadListData] error:`, e);
+    console.error('[loadListData] error:', e);
   } finally {
     state.loading = false;
     showLoading(listId, false);
   }
 }
 
-// 显示/隐藏加载指示器
 function showLoading(listId, show) {
   const loadingId = listId.replace('List', 'Loading');
   const loadingEl = document.getElementById(loadingId);
   if (loadingEl) {
     loadingEl.style.display = show ? 'block' : 'none';
+    if (!show && listState[listId]) {
+      const state = listState[listId];
+      if (state.hasMore) {
+        loadingEl.textContent = '下拉加载更多...';
+      } else if (state.records.length > 0) {
+        loadingEl.textContent = '已加载全部';
+      } else {
+        loadingEl.textContent = '';
+      }
+    }
   }
 }
 
-// 渲染列表
 function renderList(listId) {
-  const config = listConfig[listId];
+  const cfg = config[listId];
   const state = listState[listId];
-  if (!config || !state) return;
+  if (!cfg || !state) return;
 
   const container = document.getElementById(listId);
   if (!container) return;
 
   if (state.records.length === 0) {
-    container.innerHTML = '<div class="ranking-empty">' + config.emptyMsg + '</div>';
+    container.innerHTML = '<div class="ranking-empty">' + cfg.emptyMsg + '</div>';
     return;
   }
 
-  // 按日期分组
   const grouped = {};
   state.records.forEach(r => {
     const date = formatLocalDate(r.created_at);
@@ -102,17 +109,53 @@ function renderList(listId) {
 
   container.innerHTML = '';
 
-  // 生成 HTML
-  let html = '';
   for (const [date, records] of Object.entries(grouped)) {
-    html += '<div class="order-date-group" data-date="' + date + '"><div class="order-date-label">' + date + '</div>';
-    records.forEach(r => {
-      html += config.renderItem(r);
-    });
-    html += '</div>';
-  }
+    const group = document.createElement('div');
+    group.className = 'order-date-group';
+    group.setAttribute('data-date', date);
 
-  container.innerHTML = html;
+    const label = document.createElement('div');
+    label.className = 'order-date-label';
+    label.textContent = date;
+    group.appendChild(label);
+
+    records.forEach(r => {
+      const item = document.createElement('div');
+      item.innerHTML = cfg.renderItem(r);
+      group.appendChild(item.firstChild);
+    });
+
+    container.appendChild(group);
+  }
+}
+
+function setupScrollObserver(listId) {
+  const state = listState[listId];
+  if (!state || !state.hasMore) return;
+
+  const container = document.getElementById(listId);
+  if (!container) return;
+
+  // 移除旧的 sentinel
+  const oldSentinel = container.querySelector('.scroll-sentinel');
+  if (oldSentinel) oldSentinel.remove();
+
+  // 创建新的 sentinel
+  const sentinel = document.createElement('div');
+  sentinel.className = 'scroll-sentinel';
+  sentinel.style.height = '1px';
+  container.appendChild(sentinel);
+
+  const observer = new IntersectionObserver((entries) => {
+    if (entries[0].isIntersecting && !state.loading && state.hasMore) {
+      loadListData(listId);
+    }
+  }, { rootMargin: '100px' });
+
+  observer.observe(sentinel);
+
+  // 存储 observer 以便清理
+  state.observer = observer;
 }
 
 // ============================================
@@ -163,4 +206,4 @@ function renderMilkTeaItem(r) {
   return '<div class="order-item" onclick=\'openEditModal(' + JSON.stringify(r).replace(/'/g, "&#39;") + ')\'>' +
     '<div class="order-item-top"><span class="order-item-boss">奶茶</span><span class="order-item-amount">' + (r.amount || 0).toFixed(2) + '</span></div>' +
     '<div class="order-item-bottom"><span>' + (r.source || '') + '</span><span>' + time + '</span></div></div>';
-}
+}