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/geoipupdate/updater_test.go

@@ -0,0 +1,24 @@
+package geoipupdate
+
+import (
+	"os"
+	"path/filepath"
+	"testing"
+)
+
+func TestEnsureInitialDatabaseCopiesEmbeddedMMDB(t *testing.T) {
+	tempDir := t.TempDir()
+	path := filepath.Join(tempDir, "GeoLite2-Country.mmdb")
+	updater := &Updater{MMDBPath: path}
+
+	if err := updater.EnsureInitialDatabase(); err != nil {
+		t.Fatalf("EnsureInitialDatabase failed: %v", err)
+	}
+	info, err := os.Stat(path)
+	if err != nil {
+		t.Fatalf("expected mmdb to exist: %v", err)
+	}
+	if info.Size() == 0 {
+		t.Fatal("expected copied mmdb to be non-empty")
+	}
+}