feat: 凭证生成、成本分析、AI问答、前端页面、集成测试与E2E测试

- 后端: 凭证生成引擎、金蝶导出器、凭证模板服务
- 后端: 成本分析服务、AI问答服务
- 后端: 科目映射CRUD API、分析API、QA API
- 后端: 集成测试(认证/任务/凭证) 49个测试全部通过
- 前端: 凭证管理、成本分析、导出中心、知识库、系统设置页面
- 前端: AuthGuard认证守卫、Dashboard AI聊天功能
- 前端: Playwright E2E测试 16 passed, 1 skipped
- 基础设施: Docker Compose、Nginx反向代理、.env.example
- 文档: 用户手册、管理员手册、发布检查清单

frontend/components/layout/AuthGuard.tsx

@@ -0,0 +1,52 @@
+"use client";
+
+import { useEffect, useState } from "react";
+import { useRouter } from "next/navigation";
+import { useAuthStore } from "@/lib/stores/auth-store";
+
+/**
+ * 认证守卫组件
+ * 检查用户是否已登录，未登录时重定向到登录页
+ */
+export function AuthGuard({ children }: { children: React.ReactNode }) {
+  const router = useRouter();
+  const { user, token } = useAuthStore();
+  const [checked, setChecked] = useState(false);
+
+  useEffect(() => {
+    // zustand persist 从 localStorage 恢复是异步的，需要等待一帧
+    if (!user || !token) {
+      router.replace("/login");
+    } else {
+      setChecked(true);
+    }
+  }, [user, token, router]);
+
+  if (!checked) {
+    return (
+      <div className="min-h-screen flex items-center justify-center bg-background">
+        <div className="flex flex-col items-center gap-3">
+          <svg className="animate-spin w-6 h-6 text-primary" viewBox="0 0 24 24">
+            <circle
+              className="opacity-25"
+              cx="12"
+              cy="12"
+              r="10"
+              stroke="currentColor"
+              strokeWidth="4"
+              fill="none"
+            />
+            <path
+              className="opacity-75"
+              fill="currentColor"
+              d="M4 12a8 8 0 018-8V0C5.373 0 0 5.373 0 12h4zm2 5.291A7.962 7.962 0 014 12H0c0 3.042 1.135 5.824 3 7.938l3-2.647z"
+            />
+          </svg>
+          <span className="text-sm text-muted-foreground">加载中...</span>
+        </div>
+      </div>
+    );
+  }
+
+  return <>{children}</>;
+}

frontend/components/layout/Sidebar.tsx

@@ -9,7 +9,11 @@ import {
   AlertTriangle, 
   Settings,
   ChevronLeft,
-  ChevronRight
+  ChevronRight,
+  BarChart3,
+  Receipt,
+  Download,
+  BookOpen,
 } from "lucide-react";
 import { cn } from "@/lib/utils";
 import { useState } from "react";
@@ -30,6 +34,26 @@ const navItems = [
     href: "/exceptions", 
     icon: AlertTriangle 
   },
+  { 
+    label: "成本分析", 
+    href: "/analysis", 
+    icon: BarChart3 
+  },
+  { 
+    label: "凭证管理", 
+    href: "/vouchers", 
+    icon: Receipt 
+  },
+  { 
+    label: "导出中心", 
+    href: "/exports", 
+    icon: Download 
+  },
+  { 
+    label: "知识库", 
+    href: "/knowledge", 
+    icon: BookOpen 
+  },
   { 
     label: "规则设置", 
     href: "/settings/rules",