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/components/auth/register-page.tsx

@@ -0,0 +1,12 @@
+"use client"
+
+import {RegisterForm} from "@/components/auth/register-form"
+import {AuthShell} from "@/components/auth/auth-shell"
+
+export function RegisterPage() {
+  return (
+    <AuthShell wide>
+      <RegisterForm />
+    </AuthShell>
+  )
+}