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/workflows/auto-labeler.yml

@@ -1,27 +0,0 @@
-name: "Pull Request Labeler"
-on:
-  pull_request_target:
-    types: [opened, synchronize]
-
-permissions:
-  contents: read
-
-jobs:
-  labeler:
-    runs-on: ubuntu-latest
-    permissions:
-      pull-requests: write
-    steps:
-      - name: Harden Runner
-        uses: step-security/harden-runner@6c439dc8bdf85cadbbce9ed30d1c7b959517bc49 # v2.12.2
-        with:
-          egress-policy: audit
-
-      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
-
-      - name: Apply Labels
-        uses: actions/labeler@8558fd74291d67161a8a78ce36a881fa63b766a9 # v5.0.0
-        with:
-          repo-token: ${{ secrets.GITHUB_TOKEN }}
-          configuration-path: .github/labeler-config.yml
-          sync-labels: true

.github/workflows/build.yml

@@ -48,12 +48,12 @@ jobs:
         if: always()
         run: |
           declare -a dirs=(
-            "stirling-pdf/build/reports/tests/"
-            "stirling-pdf/build/test-results/"
-            "common/build/reports/tests/"
-            "common/build/test-results/"
-            "proprietary/build/reports/tests/"
-            "proprietary/build/test-results/"
+            "app/core/build/reports/tests/"
+            "app/core/build/test-results/"
+            "app/common/build/reports/tests/"
+            "app/common/build/test-results/"
+            "app/proprietary/build/reports/tests/"
+            "app/proprietary/build/test-results/"
           )
           missing_reports=()
           for dir in "${dirs[@]}"; do
@@ -74,19 +74,46 @@ jobs:
         with:
           name: test-reports-jdk-${{ matrix.jdk-version }}-spring-security-${{ matrix.spring-security }}
           path: |
-            stirling-pdf/build/reports/tests/
-            stirling-pdf/build/test-results/
-            stirling-pdf/build/reports/problems/
-            common/build/reports/tests/
-            common/build/test-results/
-            common/build/reports/problems/
-            proprietary/build/reports/tests/
-            proprietary/build/test-results/
-            proprietary/build/reports/problems/
+            app/core/build/reports/tests/
+            app/core/build/test-results/
+            app/core/build/reports/problems/
+            app/common/build/reports/tests/
+            app/common/build/test-results/
+            app/common/build/reports/problems/
+            app/proprietary/build/reports/tests/
+            app/proprietary/build/test-results/
+            app/proprietary/build/reports/problems/
             build/reports/problems/
           retention-days: 3
           if-no-files-found: warn
 
+  check-generateOpenApiDocs:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Harden Runner
+        uses: step-security/harden-runner@6c439dc8bdf85cadbbce9ed30d1c7b959517bc49 # v2.12.2
+        with:
+          egress-policy: audit
+
+      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
+
+      - name: Set up JDK 17
+        uses: actions/setup-java@c5195efecf7bdfc987ee8bae7a71cb8b11521c00 # v4.7.1
+        with:
+          java-version: "17"
+          distribution: "temurin"
+
+      - uses: gradle/actions/setup-gradle@ac638b010cf58a27ee6c972d7336334ccaf61c96 # v4.4.1
+
+      - name: Generate OpenAPI documentation
+        run: ./gradlew :stirling-pdf:generateOpenApiDocs
+      
+      - name: Upload OpenAPI Documentation
+        uses: actions/upload-artifact@ea165f8d65b6e75b540449e92b4886f43607fa02 # v4.6.2
+        with:
+          name: openapi-docs
+          path: ./SwaggerDoc.json
+
   check-licence:
     runs-on: ubuntu-latest
     steps:

.github/workflows/check_properties.yml

@@ -4,7 +4,7 @@ on:
   pull_request_target:
     types: [opened, synchronize, reopened]
     paths:
-      - "stirling-pdf/src/main/resources/messages_*.properties"
+      - "app/core/src/main/resources/messages_*.properties"
 
 permissions:
   contents: read # Allow read access to repository content
@@ -67,7 +67,7 @@ jobs:
               exit 1
             fi
             # Get changed files and filter for properties files, handle case where no matches are found
-            gh pr view ${{ steps.get-pr-data.outputs.pr_number }} --json files -q ".files[].path" | grep -E '^stirling-pdf/src/main/resources/messages_[a-zA-Z_]{2}_[a-zA-Z_]{2,7}\.properties$' > changed_files.txt || echo "No matching properties files found in PR"
+            gh pr view ${{ steps.get-pr-data.outputs.pr_number }} --json files -q ".files[].path" | grep -E '^app/core/src/main/resources/messages_[a-zA-Z_]{2}_[a-zA-Z_]{2,7}\.properties$' > changed_files.txt || echo "No matching properties files found in PR"
             # Check if any files were found
             if [ ! -s changed_files.txt ]; then
               echo "No properties files changed in this PR"
@@ -117,7 +117,7 @@ jobs:
             const changedFiles = files
               .filter(file => 
                 file.status !== "removed" &&
-                /^stirling-pdf\/src\/main\/resources\/messages_[a-zA-Z_]{2}_[a-zA-Z_]{2,7}\.properties$/.test(file.filename)
+                /^app\/core\/src\/main\/resources\/messages_[a-zA-Z_]{2}_[a-zA-Z_]{2,7}\.properties$/.test(file.filename)
               )
               .map(file => file.filename);
 
@@ -157,12 +157,12 @@ jobs:
 
             // Determine reference file
             let referenceFilePath;
-            if (changedFiles.includes("stirling-pdf/src/main/resources/messages_en_GB.properties")) {
+            if (changedFiles.includes("app/core/src/main/resources/messages_en_GB.properties")) {
               console.log("Using PR branch reference file.");
               const { data: fileContent } = await github.rest.repos.getContent({
                 owner: prRepoOwner,
                 repo: prRepoName,
-                path: "stirling-pdf/src/main/resources/messages_en_GB.properties",
+                path: "app/core/src/main/resources/messages_en_GB.properties",
                 ref: branch,
               });
 
@@ -174,7 +174,7 @@ jobs:
               const { data: fileContent } = await github.rest.repos.getContent({
                 owner: repoOwner,
                 repo: repoName,
-                path: "stirling-pdf/src/main/resources/messages_en_GB.properties",
+                path: "app/core/src/main/resources/messages_en_GB.properties",
                 ref: "main",
               });
 

.github/workflows/licenses-update.yml

@@ -57,11 +57,11 @@ jobs:
 
       - name: Move and rename license file
         run: |
-          mv build/reports/dependency-license/index.json stirling-pdf/src/main/resources/static/3rdPartyLicenses.json
+          mv build/reports/dependency-license/index.json app/core/src/main/resources/static/3rdPartyLicenses.json
 
       - name: Commit changes
         run: |
-          git add stirling-pdf/src/main/resources/static/3rdPartyLicenses.json
+          git add app/core/src/main/resources/static/3rdPartyLicenses.json
           git diff --staged --quiet || echo "CHANGES_DETECTED=true" >> $GITHUB_ENV
 
       - name: Create Pull Request

.github/workflows/multiOSReleases.yml

@@ -86,7 +86,7 @@ jobs:
         run: |
           mkdir ./binaries
           mv ./build/launch4j/Stirling-PDF.exe ./binaries/win-Stirling-PDF-portable-Server${{ matrix.file_suffix }}.exe
-          mv ./stirling-pdf/build/libs/stirling-pdf-${{ needs.read_versions.outputs.version }}.jar ./binaries/Stirling-PDF${{ matrix.file_suffix }}.jar
+          mv ./app/core/build/libs/stirling-pdf-${{ needs.read_versions.outputs.version }}.jar ./binaries/Stirling-PDF${{ matrix.file_suffix }}.jar
 
       - name: Upload build artifacts
         uses: actions/upload-artifact@ea165f8d65b6e75b540449e92b4886f43607fa02 # v4.6.2

.github/workflows/sync_files.yml

@@ -8,8 +8,8 @@ on:
     paths:
       - "build.gradle"
       - "README.md"
-      - "stirling-pdf/src/main/resources/messages_*.properties"
-      - "stirling-pdf/src/main/resources/static/3rdPartyLicenses.json"
+      - "app/core/src/main/resources/messages_*.properties"
+      - "app/core/src/main/resources/static/3rdPartyLicenses.json"
       - "scripts/ignore_translation.toml"
 
 permissions:
@@ -41,11 +41,11 @@ jobs:
 
       - name: Sync translation property files
         run: |
-          python .github/scripts/check_language_properties.py --reference-file "stirling-pdf/src/main/resources/messages_en_GB.properties" --branch main
+          python .github/scripts/check_language_properties.py --reference-file "app/core/src/main/resources/messages_en_GB.properties" --branch main
 
       - name: Commit translation files
         run: |
-          git add stirling-pdf/src/main/resources/messages_*.properties
+          git add app/core/src/main/resources/messages_*.properties
           git diff --staged --quiet || git commit -m ":memo: Sync translation files" || echo "No changes detected"
 
       - name: Install dependencies
@@ -101,4 +101,4 @@ jobs:
           sign-commits: true
           add-paths: |
             README.md
-              stirling-pdf/src/main/resources/messages_*.properties
+            app/core/src/main/resources/messages_*.properties