C2(authentik-source-build): close authentik-go-server-derivation

Go server binary builds successfully on ringtail:
- buildGoModule with apiGoVendorHook and overrideModAttrs
- Lifecycle paths patched to authentik-django store path
- Web asset paths use placeholder (resolved when webui derivation is built)
- authentik --help verified working

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

docs/how-to/authentik/authentik-go-server-derivation.md

@@ -1,7 +1,6 @@
 ---
 title: Build Authentik Go Server
-modified: 2026-02-28
-status: active
+modified: 2026-03-01
 requires:
   - authentik-api-client-generation
   - authentik-python-backend-derivation