removal of old java desktop + workspace change in tauri (#5459)

# 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)

### Translations (if applicable)

- [ ] I ran
[`scripts/counter_translation.py`](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/docs/counter_translation.md)

### 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.

app/core/src/main/java/stirling/software/SPDF/SPDFApplication.java

@@ -20,7 +20,6 @@ import org.springframework.scheduling.annotation.EnableScheduling;
 import io.github.pixee.security.SystemCommand;
 
 import jakarta.annotation.PostConstruct;
-import jakarta.annotation.PreDestroy;
 
 import lombok.extern.slf4j.Slf4j;
 
@@ -28,7 +27,6 @@ import stirling.software.common.configuration.AppConfig;
 import stirling.software.common.configuration.ConfigInitializer;
 import stirling.software.common.configuration.InstallationPathConfig;
 import stirling.software.common.model.ApplicationProperties;
-import stirling.software.common.util.UrlUtils;
 
 @Slf4j
 @EnableScheduling
@@ -60,19 +58,6 @@ public class SPDFApplication {
 
         Properties props = new Properties();
 
-        if (Boolean.parseBoolean(System.getProperty("STIRLING_PDF_DESKTOP_UI", "false"))) {
-            System.setProperty("java.awt.headless", "false");
-            app.setHeadless(false);
-            props.put("java.awt.headless", "false");
-            props.put("spring.main.web-application-type", "servlet");
-
-            int desiredPort = 8080;
-            String port = UrlUtils.findAvailablePort(desiredPort);
-            props.put("server.port", port);
-            System.setProperty("server.port", port);
-            log.info("Desktop UI mode: Using port {}", port);
-        }
-
         app.setAdditionalProfiles(getActiveProfile(args));
 
         ConfigInitializer initializer = new ConfigInitializer();
@@ -153,13 +138,6 @@ public class SPDFApplication {
                     "Running in Tauri mode. Parent process PID: {}",
                     parentPid != null ? parentPid : "not set");
         }
-        // Desktop UI initialization removed - webBrowser dependency eliminated
-        // Keep backwards compatibility for STIRLING_PDF_DESKTOP_UI system property
-        if (Boolean.parseBoolean(System.getProperty("STIRLING_PDF_DESKTOP_UI", "false"))) {
-            log.info("Desktop UI mode enabled, but WebBrowser functionality has been removed");
-            // webBrowser.initWebUI(url); // Removed - desktop UI eliminated
-        }
-
         // Standard browser opening logic
         String browserOpenEnv = env.getProperty("BROWSER_OPEN");
         boolean browserOpen = browserOpenEnv != null && "true".equalsIgnoreCase(browserOpenEnv);
@@ -192,14 +170,6 @@ public class SPDFApplication {
         }
     }
 
-    @PreDestroy
-    public void cleanup() {
-        // webBrowser cleanup removed - desktop UI eliminated
-        // if (webBrowser != null) {
-        //     webBrowser.cleanup();
-        // }
-    }
-
     @EventListener
     public void onWebServerInitialized(WebServerInitializedEvent event) {
         int actualPort = event.getWebServer().getPort();