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/layout/robots-meta.tsx

@@ -0,0 +1,17 @@
+"use client"
+
+import {usePublicConfig} from "@/hooks/use-public-config"
+
+export function RobotsMeta() {
+  const { config } = usePublicConfig()
+
+  // Default to noindex, nofollow if config is loading or if it's explicitly disabled
+  const enabled = config?.search_engine_indexing_enabled === "true"
+
+  return (
+    <meta
+      name="robots"
+      content={enabled ? "index, follow" : "noindex, nofollow"}
+    />
+  )
+}