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 <[email protected]>

Dockerfile

@@ -25,20 +25,16 @@ LABEL org.opencontainers.image.keywords="PDF, manipulation, merge, split, conver
 # Set Environment Variables
 ENV DOCKER_ENABLE_SECURITY=false \
     VERSION_TAG=$VERSION_TAG \
-    JAVA_TOOL_OPTIONS="-XX:+UnlockExperimentalVMOptions \
-    -XX:MaxRAMPercentage=75 \
-    -XX:InitiatingHeapOccupancyPercent=20 \
-    -XX:+G1PeriodicGCInvokesConcurrent \
-    -XX:G1PeriodicGCInterval=10000 \
-    -XX:+UseStringDeduplication \
-    -XX:G1PeriodicGCSystemLoadThreshold=70" \
+    JAVA_BASE_OPTS="-XX:+UnlockExperimentalVMOptions -XX:MaxRAMPercentage=75 -XX:InitiatingHeapOccupancyPercent=20 -XX:+G1PeriodicGCInvokesConcurrent -XX:G1PeriodicGCInterval=10000 -XX:+UseStringDeduplication -XX:G1PeriodicGCSystemLoadThreshold=70" \
+    JAVA_CUSTOM_OPTS="" \
     HOME=/home/stirlingpdfuser \
     PUID=1000 \
     PGID=1000 \
     UMASK=022 \
     PYTHONPATH=/usr/lib/libreoffice/program:/opt/venv/lib/python3.12/site-packages \
     UNO_PATH=/usr/lib/libreoffice/program \
-    URE_BOOTSTRAP=file:///usr/lib/libreoffice/program/fundamentalrc
+    URE_BOOTSTRAP=file:///usr/lib/libreoffice/program/fundamentalrc \
+    PATH=$PATH:/opt/venv/bin
 
 
 # JDK for app
@@ -77,7 +73,6 @@ RUN echo "@main https://dl-cdn.alpinelinux.org/alpine/edge/main" | tee -a /etc/a
     py3-pillow@testing \
     py3-pdf2image@testing && \
     python3 -m venv /opt/venv && \
-    export PATH="/opt/venv/bin:$PATH" && \
     pip install --upgrade pip && \
     pip install --no-cache-dir --upgrade unoserver weasyprint && \
     ln -s /usr/lib/libreoffice/program/uno.py /opt/venv/lib/python3.12/site-packages/ && \