Add server.address property and update issuer field in LoginController to use dynamic server address. Modify SQL query in PrivilegedUserMapper to simplify permissions retrieval.

backend/src/main/java/com/alttd/altitudeweb/controllers/login/LoginController.java

@@ -36,6 +36,9 @@ public class LoginController implements LoginApi {
     @Value("${login.secret:#{null}}")
     private String loginSecret;
 
+    @Value("${server.address:#{null}}")
+    private String serverAddress;
+
     private record CacheEntry(UUID uuid, Instant expiry) {}
 
     private static final ConcurrentMap<String, CacheEntry> cache = new ConcurrentHashMap<>();
@@ -160,7 +163,7 @@ public class LoginController implements LoginApi {
             }
         }));
         JwtClaimsSet claims = JwtClaimsSet.builder()
-                .issuer("altitudeweb")
+                .issuer(serverAddress)
                 .claim("authorities", claimList.stream().map(PermissionClaimDto::getValue).toList())
                 .issuedAt(now)
                 .expiresAt(expiryTime)