refactor: move modules under app/ directory and update file paths (#3938)

# Description of Changes

- **What was changed:**  
- Renamed top-level directories: `stirling-pdf` → `app/core`, `common` →
`app/common`, `proprietary` → `app/proprietary`.
- Updated all path references in `.gitattributes`, GitHub workflows
(`.github/workflows/*`), scripts (`.github/scripts/*`), `.gitignore`,
Dockerfiles, license files, and template settings to reflect the new
structure.
- Added a new CI job `check-generateOpenApiDocs` to generate and upload
OpenAPI documentation.
- Removed redundant `@Autowired` annotations from `TempFileShutdownHook`
and `UnlockPDFFormsController`.
- Minor formatting and comment adjustments in YAML templates and
resource files.

- **Why the change was made:**  
- To introduce a clear `app/` directory hierarchy for core, common, and
proprietary modules, improving organization and maintainability.
- To ensure continuous integration and Docker builds continue to work
seamlessly with the reorganized structure.
- To automate OpenAPI documentation generation as part of the CI
pipeline.

---

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

.github/labeler-config-srvaroa.yml

@@ -34,6 +34,9 @@ labels:
   - label: "Documentation"
     title: '^docs(\([^)]*\))?:|^docs:.*'
 
+  - label: "Documentation"
+    title: '^.*\(docs\):.*'
+
   - label: "dependencies"
     title: '^deps(\([^)]*\))?:|^deps:.*'
 
@@ -45,53 +48,53 @@ labels:
 
   - label: 'Translation'
     files:
-      - 'stirling-pdf/src/main/resources/messages_[a-zA-Z_]{2}_[a-zA-Z_]{2,7}.properties'
+      - 'app/core/src/main/resources/messages_[a-zA-Z_]{2}_[a-zA-Z_]{2,7}.properties'
       - 'scripts/ignore_translation.toml'
-      - 'stirling-pdf/src/main/resources/templates/fragments/languages.html'
+      - 'app/core/src/main/resources/templates/fragments/languages.html'
       - '.github/scripts/check_language_properties.py'
 
   - label: 'Front End'
     files:
-      - 'stirling-pdf/src/main/resources/templates/.*'
-      - 'proprietary/src/main/resources/templates/.*'
-      - 'stirling-pdf/src/main/resources/static/.*'
-      - 'proprietary/src/main/resources/static/.*'
-      - 'stirling-pdf/src/main/java/stirling/software/SPDF/controller/web/.*'
-      - 'stirling-pdf/src/main/java/stirling/software/SPDF/UI/.*'
-      - 'proprietary/src/main/java/stirling/software/proprietary/security/controller/web/.*'
+      - 'app/core/src/main/resources/templates/.*'
+      - 'app/proprietary/src/main/resources/templates/.*'
+      - 'app/core/src/main/resources/static/.*'
+      - 'app/proprietary/src/main/resources/static/.*'
+      - 'app/core/src/main/java/stirling/software/SPDF/controller/web/.*'
+      - 'app/core/src/main/java/stirling/software/SPDF/UI/.*'
+      - 'app/proprietary/src/main/java/stirling/software/proprietary/security/controller/web/.*'
 
   - label: 'Java'
     files:
-      - 'common/src/main/java/.*.java'
-      - 'proprietary/src/main/java/.*.java'
-      - 'stirling-pdf/src/main/java/.*.java'
+      - 'app/common/src/main/java/.*.java'
+      - 'app/proprietary/src/main/java/.*.java'
+      - 'app/core/src/main/java/.*.java'
 
   - label: 'Back End'
     files:
-      - 'stirling-pdf/src/main/java/stirling/software/SPDF/config/.*'
-      - 'stirling-pdf/src/main/java/stirling/software/SPDF/controller/.*'
-      - 'stirling-pdf/src/main/resources/settings.yml.template'
-      - 'stirling-pdf/src/main/resources/application.properties'
-      - 'stirling-pdf/src/main/resources/banner.txt'
+      - 'app/core/src/main/java/stirling/software/SPDF/config/.*'
+      - 'app/core/src/main/java/stirling/software/SPDF/controller/.*'
+      - 'app/core/src/main/resources/settings.yml.template'
+      - 'app/core/src/main/resources/application.properties'
+      - 'app/core/src/main/resources/banner.txt'
       - 'scripts/png_to_webp.py'
       - 'split_photos.py'
       - 'application.properties'
 
   - label: 'Security'
     files:
-      - 'proprietary/src/main/java/stirling/software/proprietary/security/.*'
+      - 'app/proprietary/src/main/java/stirling/software/proprietary/security/.*'
       - 'scripts/download-security-jar.sh'
       - '.github/workflows/dependency-review.yml'
       - '.github/workflows/scorecards.yml'
 
   - label: 'API'
     files:
-      - 'stirling-pdf/src/main/java/stirling/software/SPDF/config/OpenApiConfig.java'
-      - 'stirling-pdf/src/main/java/stirling/software/SPDF/controller/web/MetricsController.java'
-      - 'stirling-pdf/src/main/java/stirling/software/SPDF/controller/api/.*'
-      - 'stirling-pdf/src/main/java/stirling/software/SPDF/model/api/.*'
-      - 'stirling-pdf/src/main/java/stirling/software/SPDF/service/ApiDocService.java'  
-      - 'proprietary/src/main/java/stirling/software/proprietary/security/controller/api/.*'
+      - 'app/core/src/main/java/stirling/software/SPDF/config/OpenApiConfig.java'
+      - 'app/core/src/main/java/stirling/software/SPDF/controller/web/MetricsController.java'
+      - 'app/core/src/main/java/stirling/software/SPDF/controller/api/.*'
+      - 'app/core/src/main/java/stirling/software/SPDF/model/api/.*'
+      - 'app/core/src/main/java/stirling/software/SPDF/service/ApiDocService.java'
+      - 'app/proprietary/src/main/java/stirling/software/proprietary/security/controller/api/.*'
       - 'scripts/png_to_webp.py'
       - 'split_photos.py'
       - '.github/workflows/swagger.yml'
@@ -127,12 +130,13 @@ labels:
       - '.github/workflows/pre_commit.yml'
       - 'devGuide/.*'
       - 'devTools/.*'
+      - 'devTools/.*'
 
   - label: 'Test'
     files:
-      - 'common/src/test/.*'
-      - 'proprietary/src/test/.*'
-      - 'stirling-pdf/src/test/.*'
+      - 'app/common/src/test/.*'
+      - 'app/proprietary/src/test/.*'
+      - 'app/core/src/test/.*'
       - 'testing/.*'
       - '.github/workflows/scorecards.yml'
       - 'exampleYmlFiles/test_cicd.yml'
@@ -148,6 +152,6 @@ labels:
       - 'gradlew.bat'
       - 'settings.gradle'
       - 'build.gradle'
-      - 'common/build.gradle'
-      - 'proprietary/build.gradle'
-      - 'stirling-pdf/build.gradle'
+      - 'app/common/build.gradle'
+      - 'app/proprietary/build.gradle'
+      - 'app/core/build.gradle'