Saml fixes (#5256)

# Description of Changes

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Please provide a summary of the changes, including:

- What was changed
- Why the change was made
- Any challenges encountered

Closes #(issue_number)
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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/core/src/main/java/stirling/software/SPDF/SPDFApplication.java

@@ -138,13 +138,13 @@ public class SPDFApplication {
 
     @PostConstruct
     public void init() {
-        String baseUrl = appConfig.getBaseUrl();
+        String backendUrl = appConfig.getBackendUrl();
         String contextPath = appConfig.getContextPath();
         String serverPort = appConfig.getServerPort();
-        baseUrlStatic = baseUrl;
+        baseUrlStatic = backendUrl;
         contextPathStatic = contextPath;
         serverPortStatic = serverPort;
-        String url = baseUrl + ":" + getStaticPort() + contextPath;
+        String url = backendUrl + ":" + getStaticPort() + contextPath;
 
         // Log Tauri mode information
         if (Boolean.parseBoolean(System.getProperty("STIRLING_PDF_TAURI_MODE", "false"))) {

app/core/src/main/java/stirling/software/SPDF/controller/api/misc/ConfigController.java

@@ -66,7 +66,8 @@ public class ConfigController {
             AppConfig appConfig = applicationContext.getBean(AppConfig.class);
 
             // Extract key configuration values from AppConfig
-            configData.put("baseUrl", appConfig.getBaseUrl());
+            // Note: Frontend expects "baseUrl" field name for compatibility
+            configData.put("baseUrl", appConfig.getBackendUrl());
             configData.put("contextPath", appConfig.getContextPath());
             configData.put("serverPort", appConfig.getServerPort());