Libre threads (#5303)

# Description of Changes

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- 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/controller/api/converters/ConvertOfficeController.java

@@ -97,8 +97,6 @@ public class ConvertOfficeController {
                 // Unoconvert: schreibe direkt in outputPath innerhalb des workDir
                 List<String> command = new ArrayList<>();
                 command.add(runtimePathConfig.getUnoConvertPath());
-                command.add("--port");
-                command.add("2003");
                 command.add("--convert-to");
                 command.add("pdf");
                 command.add(inputPath.toString());

app/core/src/main/resources/settings.yml.template

@@ -242,8 +242,20 @@ AutomaticallyGenerated:
   appVersion: 0.35.0
 
 processExecutor:
+  autoUnoServer: true # true: use local pool based on libreOfficeSessionLimit; false: use unoServerEndpoints
+  unoServerEndpoints: [] # Used when autoUnoServer is false
+  # Example manual endpoints (uncomment to use):
+  # unoServerEndpoints:
+  #   - host: "127.0.0.1"
+  #     port: 2003
+  #     hostLocation: "auto"  # auto|local|remote (use "remote" for port-forwarded servers)
+  #     protocol: "http"       # http|https
+  #   - host: "remote-server.local"
+  #     port: 8080
+  #     hostLocation: "remote"
+  #     protocol: "https"
   sessionLimit: # Process executor instances limits
-    libreOfficeSessionLimit: 1
+    libreOfficeSessionLimit: 1 # Each additional uno server adds ~50MB idle RAM
     pdfToHtmlSessionLimit: 1
     qpdfSessionLimit: 4
     tesseractSessionLimit: 1