refactor(repo): consolidate openflare-server to root and move subprojects to internal/apps

- Merge all files inside openflare-server to the repository root directory.
- Relocate agent, relay, and flared subprojects from internal/ to internal/apps/.
- Combine docker-compose files and update build context paths to root.
- Update GitHub workflows and Dockerfiles to refer to new directories and package names.
- Rewrite Go package imports across all files.
- Resolve database renew test race condition and clean up docs.

frontend/app/layout.tsx

@@ -0,0 +1,56 @@
+import type {Metadata} from "next";
+import {Toaster} from "@/components/ui/sonner";
+import {ThemeProvider} from "@/components/layout/theme-provider";
+import {CustomThemeProvider} from "@/lib/theme";
+import {BellRingProvider} from "@/contexts/bell-ring-context";
+import {NotificationSettingsProvider} from "@/contexts/notification-settings-context";
+import {UserProvider} from "@/contexts/user-context";
+import {AppQueryProvider} from "@/components/providers/query-provider";
+import {SiteTitleUpdater} from "@/components/providers/title-updater";
+import {RobotsMeta} from "@/components/layout/robots-meta";
+import "./globals.css";
+
+export const metadata: Metadata = {
+  title: "OpenFlare",
+  description: "OpenFlare 边缘节点与反向代理管理平台",
+};
+
+export default function RootLayout({
+  children,
+}: Readonly<{
+  children: React.ReactNode;
+}>) {
+  return (
+    <html
+      lang="zh-CN"
+      className="hide-scrollbar font-sans"
+      suppressHydrationWarning
+    >
+      <body
+        className="hide-scrollbar font-sans antialiased"
+      >
+        <ThemeProvider
+          attribute="class"
+          defaultTheme="system"
+          enableSystem
+          disableTransitionOnChange
+        >
+          <CustomThemeProvider>
+            <AppQueryProvider>
+              <SiteTitleUpdater />
+              <RobotsMeta />
+              <UserProvider>
+                <NotificationSettingsProvider>
+                  <BellRingProvider>
+                    {children}
+                    <Toaster position="top-center" />
+                  </BellRingProvider>
+                </NotificationSettingsProvider>
+              </UserProvider>
+            </AppQueryProvider>
+          </CustomThemeProvider>
+        </ThemeProvider>
+      </body>
+    </html>
+  );
+}