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.

pkg/geoip/emptyProvider.go

@@ -0,0 +1,25 @@
+package geoip
+
+import (
+	"fmt"
+	"net"
+)
+
+type EmptyProvider struct{}
+
+func (e *EmptyProvider) Name() string {
+	return "EmptyProvider"
+}
+
+func (e *EmptyProvider) Initialize() error {
+	return nil
+}
+func (e *EmptyProvider) GetGeoInfo(ip net.IP) (*GeoInfo, error) {
+	return nil, fmt.Errorf("you are using an empty GeoIP provider, please set a valid provider")
+}
+func (e *EmptyProvider) UpdateDatabase() error {
+	return fmt.Errorf("you are using an empty GeoIP provider, please set a valid provider")
+}
+func (e *EmptyProvider) Close() error {
+	return nil
+}