Dodaj admin web panel u repo (admin/), sinhronizuj systemd unite

- admin/: LAN web panel (Flask + waitress + python-pam), status servisa,
  PAM login sa idriz korisnikom, vertikalni meni. Port 8080, samo LAN.
- systemd/idriz-admin.service: korisnički servis, enabled + Restart=always
  + StartLimitIntervalSec=0.
- systemd/idriz.service: dodan StartLimitIntervalSec=0 (repo je bio zastario).

Od sada sav aplikacioni source code ide u ovaj repo.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01LzKpYaEsuWDevuNnvSjcFW

admin/requirements.txt

@@ -0,0 +1,10 @@
+blinker==1.9.0
+click==8.5.0
+Flask==3.1.3
+itsdangerous==2.2.0
+Jinja2==3.1.6
+MarkupSafe==3.0.3
+python-pam==2.0.2
+six==1.17.0
+waitress==3.0.2
+Werkzeug==3.1.8