build: 优化 Docker/Workflow 构建，使用 Next.js 环境变量注入版本和构建时间，并移除对 package.json 的硬编码替换

frontend/components/layout/sidebar.tsx

@@ -3,7 +3,7 @@
 import * as React from "react"
 import Link from "next/link"
 import {usePathname, useRouter} from "next/navigation"
-import packageJson from "../../package.json"
+import {APP_VERSION, APP_BUILD_DATE} from "@/lib/app-info"
 import {toast} from "sonner"
 import {Button} from "@/components/ui/button"
 import {Spinner} from "@/components/ui/spinner"
@@ -384,8 +384,8 @@ export function AppSidebar({ ...props }: React.ComponentProps<typeof Sidebar>) {
         </SidebarContent>
         <SidebarFooter className="mt-auto px-3 py-3 group-data-[collapsible=icon]:hidden">
           <div className="border-t border-border/60 pt-3 text-[11px] leading-5 text-muted-foreground">
-            <div>Version {packageJson.version}</div>
-            <div>Build At {packageJson.buildDate}</div>
+            <div>Version {APP_VERSION}</div>
+            {APP_BUILD_DATE && <div>Build At {APP_BUILD_DATE}</div>}
           </div>
         </SidebarFooter>
       </Sidebar>