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/icon.tsx

@@ -0,0 +1,33 @@
+import {ImageResponse} from 'next/og'
+import {WavesIcon} from 'lucide-react'
+
+export const dynamic = 'force-static'
+
+export const size = {
+  width: 32,
+  height: 32,
+}
+export const contentType = 'image/png'
+
+export default function Icon() {
+  return new ImageResponse(
+    (
+      <div
+        style={{
+          background: 'black',
+          width: '100%',
+          height: '100%',
+          display: 'flex',
+          alignItems: 'center',
+          justifyContent: 'center',
+          borderRadius: '20%',
+        }}
+      >
+        <WavesIcon color="white" size={20} />
+      </div>
+    ),
+    {
+      ...size,
+    }
+  )
+}