C2(authentik-source-build): close build-authentik-from-source

All components assembled into default.nix: webui → authentik-django
→ authentik-server, with ak wrapper and container entrypoint. Tested
on ringtail via test-build.nix -A assembled. The chain is complete.

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

docs/how-to/authentik/build-authentik-from-source.md

@@ -1,7 +1,6 @@
 ---
 title: Build Authentik from Source
-modified: 2026-02-28
-status: active
+modified: 2026-03-01
 branch: mikado/authentik-source-build
 requires:
   - authentik-go-server-derivation