Saml fixes (#5256)

# Description of Changes

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- Why the change was made
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## Checklist

### General

- [ ] I have read the [Contribution
Guidelines](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/CONTRIBUTING.md)
- [ ] I have read the [Stirling-PDF Developer
Guide](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/devGuide/DeveloperGuide.md)
(if applicable)
- [ ] I have read the [How to add new languages to
Stirling-PDF](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/devGuide/HowToAddNewLanguage.md)
(if applicable)
- [ ] I have performed a self-review of my own code
- [ ] My changes generate no new warnings

### Documentation

- [ ] I have updated relevant docs on [Stirling-PDF's doc
repo](https://github.com/Stirling-Tools/Stirling-Tools.github.io/blob/main/docs/)
(if functionality has heavily changed)
- [ ] I have read the section [Add New Translation
Tags](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/devGuide/HowToAddNewLanguage.md#add-new-translation-tags)
(for new translation tags only)

### UI Changes (if applicable)

- [ ] Screenshots or videos demonstrating the UI changes are attached
(e.g., as comments or direct attachments in the PR)

### Testing (if applicable)

- [ ] I have tested my changes locally. Refer to the [Testing
Guide](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/devGuide/DeveloperGuide.md#6-testing)
for more details.

---------

Co-authored-by: ConnorYoh <40631091+ConnorYoh@users.noreply.github.com>

app/proprietary/src/main/java/stirling/software/proprietary/security/CustomLogoutSuccessHandler.java

@@ -198,7 +198,7 @@ public class CustomLogoutSuccessHandler extends SimpleUrlLogoutSuccessHandler {
     private SamlClient getSamlClient(
             String registrationId, SAML2 samlConf, List<X509Certificate> certificates)
             throws SamlException {
-        String serverUrl = appConfig.getBaseUrl() + ":" + appConfig.getServerPort();
+        String serverUrl = appConfig.getBackendUrl() + ":" + appConfig.getServerPort();
 
         String relyingPartyIdentifier =
                 serverUrl + "/saml2/service-provider-metadata/" + registrationId;

app/proprietary/src/main/java/stirling/software/proprietary/security/configuration/SecurityConfiguration.java

@@ -344,7 +344,8 @@ public class SecurityConfiguration {
                                         log.error("Error configuring SAML 2 login", e);
                                         throw new RuntimeException(e);
                                     }
-                                });
+                                })
+                        .saml2Metadata(metadata -> {});
             }
         } else {
             log.debug("Login is not enabled.");

app/proprietary/src/main/java/stirling/software/proprietary/security/saml2/Saml2Configuration.java

@@ -102,16 +102,31 @@ public class Saml2Configuration {
             log.error("Failed to load SAML2 SP credentials: {}", e.getMessage(), e);
             throw new IllegalStateException("Failed to load SAML2 SP credentials", e);
         }
+
+        // Get backend URL from configuration (for SAML endpoints)
+        String backendUrl = applicationProperties.getSystem().getBackendUrl();
+        if (backendUrl == null || backendUrl.isBlank()) {
+            backendUrl = "{baseUrl}"; // Fallback to Spring's auto-resolution
+            log.warn(
+                    "system.backendUrl not configured - SAML metadata will use request-based URLs. Set system.backendUrl for production use.");
+        } else {
+            log.info("Using configured backend URL for SAML: {}", backendUrl);
+        }
+
+        String entityId =
+                backendUrl + "/saml2/service-provider-metadata/" + samlConf.getRegistrationId();
+        String acsLocation = backendUrl + "/login/saml2/sso/{registrationId}";
+        String sloResponseLocation = backendUrl + "/login";
+
         RelyingPartyRegistration rp =
                 RelyingPartyRegistration.withRegistrationId(samlConf.getRegistrationId())
                         .signingX509Credentials(c -> c.add(signingCredential))
-                        .entityId(samlConf.getIdpIssuer())
+                        .entityId(entityId)
                         .singleLogoutServiceBinding(Saml2MessageBinding.POST)
                         .singleLogoutServiceLocation(samlConf.getIdpSingleLogoutUrl())
-                        .singleLogoutServiceResponseLocation("{baseUrl}/login")
+                        .singleLogoutServiceResponseLocation(sloResponseLocation)
                         .assertionConsumerServiceBinding(Saml2MessageBinding.POST)
-                        .assertionConsumerServiceLocation(
-                                "{baseUrl}/login/saml2/sso/{registrationId}")
+                        .assertionConsumerServiceLocation(acsLocation)
                         .authnRequestsSigned(true)
                         .assertingPartyMetadata(
                                 metadata ->
@@ -127,7 +142,7 @@ public class Saml2Configuration {
                                                 .singleLogoutServiceLocation(
                                                         samlConf.getIdpSingleLogoutUrl())
                                                 .singleLogoutServiceResponseLocation(
-                                                        "{baseUrl}/login")
+                                                        sloResponseLocation)
                                                 .wantAuthnRequestsSigned(true))
                         .build();
 

app/proprietary/src/test/java/stirling/software/proprietary/service/UserLicenseSettingsServiceTest.java

@@ -51,7 +51,8 @@ class UserLicenseSettingsServiceTest {
 
         when(applicationProperties.getPremium()).thenReturn(premium);
         when(applicationProperties.getAutomaticallyGenerated()).thenReturn(automaticallyGenerated);
-        when(automaticallyGenerated.getIsNewServer()).thenReturn(false); // Default: not a new server
+        when(automaticallyGenerated.getIsNewServer())
+                .thenReturn(false); // Default: not a new server
         when(settingsRepository.findSettings()).thenReturn(Optional.of(mockSettings));
         when(userService.getTotalUsersCount()).thenReturn(80L);
         when(settingsRepository.save(any(UserLicenseSettings.class)))