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.

internal/apps/agent/geoipdata/data.go

@@ -0,0 +1,8 @@
+package geoipdata
+
+import "embed"
+
+//go:embed GeoLite2-Country.mmdb
+var FS embed.FS
+
+const DefaultMMDBName = "GeoLite2-Country.mmdb"