feat: BIND DNS Web Manager - Web interface for managing BIND9 DNS server

- Flask + SQLite web app with user authentication
- Zone management: create/delete zones, edit raw zone files
- Record management: add/delete A/AAAA/CNAME/MX/TXT/NS/PTR/SRV/CAA records
- Service control: start/stop/restart/reload BIND via systemctl/rndc
- Configuration editor: edit named.conf.options/local with syntax validation
- DNS query testing: online dig tool
- Audit log: all operations logged with user/timestamp
- BIND9 backend, listening on port 53

wsgi.py

@@ -0,0 +1,12 @@
+import os
+os.makedirs(os.path.join(os.path.dirname(__file__), "instance"), exist_ok=True)
+
+from app import app, db, seed_admin
+
+# Initialize DB - safe for multi-worker gunicorn
+with app.app_context():
+    try:
+        db.create_all()
+        seed_admin()
+    except Exception as e:
+        print(f"[wsgi] DB init: {e} (likely race condition with another worker, safe to ignore)")