feat: allow 'all' for policy source and destination zones

backend/app/shorewall_generator.py

@@ -35,7 +35,9 @@ class ShorewallGenerator:
     def policy(self) -> str:
         lines = [self._header("policy"), "#SOURCE".ljust(16) + "DEST".ljust(16) + "POLICY".ljust(16) + "LOG LEVEL\n"]
         for p in sorted(self._config.policies, key=lambda x: x.position):
-            lines.append(self._col(p.src_zone.name, p.dst_zone.name, p.policy, p.log_level or "-"))
+            src = p.src_zone.name if p.src_zone else "all"
+            dst = p.dst_zone.name if p.dst_zone else "all"
+            lines.append(self._col(src, dst, p.policy, p.log_level or "-"))
         return "".join(lines)
 
     def rules(self) -> str: