Add versioning support to build artifacts and log outputs

- Introduced `Version` variable, set during build via `-ldflags`, to embed application version.
- Updated Dockerfile to accept `APP_VERSION` argument for version injection during build.
- Modified `.goreleaser.yml` to pass GitHub release tag as version via `ldflags`.
- Added version logging in the application startup.

.goreleaser.yml

@@ -9,6 +9,8 @@ builds:
       - arm64
     main: ./cmd/server/
     binary: cli-proxy-api
+    ldflags:
+      - -X 'main.Version={{.GORELEASER_CURRENT_TAG}}'
 archives:
   - id: "cli-proxy-api"
     format: tar.gz