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/(main)/settings/layout.tsx

@@ -0,0 +1,11 @@
+"use client"
+
+import {RequireAuth} from "@/components/auth/require-auth"
+
+export default function SettingsLayout({
+  children,
+}: {
+  children: React.ReactNode
+}) {
+  return <RequireAuth>{children}</RequireAuth>
+}