Security fixes, enterprise stuff and more (#3241)

# Description of Changes

Please provide a summary of the changes, including:

- Enable user to add custom JAVA ops with env JAVA_CUSTOM_OPTS
- Added support for prometheus (enabled via JAVA_CUSTOM_OPTS +
enterprise license)
- Changed settings from enterprise naming to 'Premium'
- KeygenLicense Check to support offline licenses
- Disable URL-to-PDF due to huge security bug
- Remove loud Split PDF logs
- addUsers renamed to adminSettings
- Added Usage analytics page
- Add user button to only be enabled based on total users free
- Improve Merge memory usage


Closes #(issue_number)

---

## 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/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/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/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/DeveloperGuide.md#6-testing)
for more details.

---------

Co-authored-by: a <a>
Co-authored-by: pixeebot[bot] <104101892+pixeebot[bot]@users.noreply.github.com>
Co-authored-by: Connor Yoh <con.yoh13@gmail.com>

src/main/java/stirling/software/SPDF/config/ConfigInitializer.java

@@ -9,6 +9,7 @@ import java.nio.file.Files;
 import java.nio.file.Path;
 import java.nio.file.Paths;
 import java.nio.file.StandardCopyOption;
+import java.util.List;
 
 import lombok.extern.slf4j.Slf4j;
 
@@ -56,6 +57,8 @@ public class ConfigInitializer {
             YamlHelper settingsTemplateFile = new YamlHelper(tempTemplatePath);
             YamlHelper settingsFile = new YamlHelper(settingTempPath);
 
+            migrateEnterpriseEditionToPremium(settingsFile, settingsTemplateFile);
+
             boolean changesMade =
                     settingsTemplateFile.updateValuesFromYaml(settingsFile, settingsTemplateFile);
             if (changesMade) {
@@ -76,4 +79,46 @@ public class ConfigInitializer {
             log.info("Created custom_settings file: {}", customSettingsPath.toString());
         }
     }
+
+    // TODO: Remove post migration
+    private void migrateEnterpriseEditionToPremium(YamlHelper yaml, YamlHelper template) {
+        if (yaml.getValueByExactKeyPath("enterpriseEdition", "enabled") != null) {
+            template.updateValue(
+                    List.of("premium", "enabled"),
+                    yaml.getValueByExactKeyPath("enterpriseEdition", "enabled"));
+        }
+        if (yaml.getValueByExactKeyPath("enterpriseEdition", "key") != null) {
+            template.updateValue(
+                    List.of("premium", "key"),
+                    yaml.getValueByExactKeyPath("enterpriseEdition", "key"));
+        }
+        if (yaml.getValueByExactKeyPath("enterpriseEdition", "SSOAutoLogin") != null) {
+            template.updateValue(
+                    List.of("premium", "proFeatures", "SSOAutoLogin"),
+                    yaml.getValueByExactKeyPath("enterpriseEdition", "SSOAutoLogin"));
+        }
+        if (yaml.getValueByExactKeyPath("enterpriseEdition", "CustomMetadata", "autoUpdateMetadata")
+                != null) {
+            template.updateValue(
+                    List.of("premium", "proFeatures", "CustomMetadata", "autoUpdateMetadata"),
+                    yaml.getValueByExactKeyPath(
+                            "enterpriseEdition", "CustomMetadata", "autoUpdateMetadata"));
+        }
+        if (yaml.getValueByExactKeyPath("enterpriseEdition", "CustomMetadata", "author") != null) {
+            template.updateValue(
+                    List.of("premium", "proFeatures", "CustomMetadata", "author"),
+                    yaml.getValueByExactKeyPath("enterpriseEdition", "CustomMetadata", "author"));
+        }
+        if (yaml.getValueByExactKeyPath("enterpriseEdition", "CustomMetadata", "creator") != null) {
+            template.updateValue(
+                    List.of("premium", "proFeatures", "CustomMetadata", "creator"),
+                    yaml.getValueByExactKeyPath("enterpriseEdition", "CustomMetadata", "creator"));
+        }
+        if (yaml.getValueByExactKeyPath("enterpriseEdition", "CustomMetadata", "producer")
+                != null) {
+            template.updateValue(
+                    List.of("premium", "proFeatures", "CustomMetadata", "producer"),
+                    yaml.getValueByExactKeyPath("enterpriseEdition", "CustomMetadata", "producer"));
+        }
+    }
 }