New common module (#3573)

# Description of Changes

Introduced a new `common` module for shared libs and commonly used
classes. See the screenshot below for the file structure and classes
that have been moved.

---
<img width="452" alt="Screenshot 2025-05-22 at 11 46 56"
src="https://github.com/user-attachments/assets/c9badabc-48f9-4079-b83e-7cfde0fb840f"
/>
<img width="470" alt="Screenshot 2025-05-22 at 11 47 30"
src="https://github.com/user-attachments/assets/e8315b09-2e78-4c50-b9de-4dd9b9b0ecb1"
/>

## Checklist

### General

- [x] I have read the [Contribution
Guidelines](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/CONTRIBUTING.md)
- [x] I have read the [Stirling-PDF Developer
Guide](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/DeveloperGuide.md)
(if applicable)
- [x] 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)
- [x] I have performed a self-review of my own code
- [x] 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)

- [x] Screenshots or videos demonstrating the UI changes are attached
(e.g., as comments or direct attachments in the PR)

### Testing (if applicable)

- [x] 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.

src/main/resources/application.properties

@@ -21,18 +21,19 @@ spring.servlet.multipart.max-file-size=2000MB
 spring.servlet.multipart.max-request-size=2000MB
 server.servlet.session.tracking-modes=cookie
 server.servlet.context-path=${SYSTEM_ROOTURIPATH:/}
-spring.devtools.restart.enabled=true
+spring.devtools.restart.enabled=false
 spring.devtools.livereload.enabled=true
 spring.devtools.restart.exclude=stirling.software.SPDF.config.security/**
 spring.thymeleaf.encoding=UTF-8
 spring.web.resources.mime-mappings.webmanifest=application/manifest+json
 spring.mvc.async.request-timeout=${SYSTEM_CONNECTIONTIMEOUTMILLISECONDS:1200000}
 
+management.endpoints.web.exposure.include=beans
 spring.datasource.url=jdbc:h2:file:./configs/stirling-pdf-DB-2.3.232;DB_CLOSE_DELAY=-1;DB_CLOSE_ON_EXIT=FALSE;MODE=PostgreSQL
 spring.datasource.driver-class-name=org.h2.Driver
 spring.datasource.username=sa
 spring.datasource.password=
-spring.h2.console.enabled=false
+spring.h2.console.enabled=true
 spring.jpa.hibernate.ddl-auto=update
 server.servlet.session.timeout:30m
 # Change the default URL path for OpenAPI JSON

src/main/resources/settings.yml.template

@@ -62,8 +62,9 @@ security:
 
 premium:
   key: 00000000-0000-0000-0000-000000000000
-  enabled: false # Enable license key checks for pro/enterprise features
+  enabled: true # Enable license key checks for pro/enterprise features
   proFeatures:
+    database: true # Enable database features
     SSOAutoLogin: false
     CustomMetadata:
       autoUpdateMetadata: false