PDF Text editor (#4724)

## Summary
- add a `PdfJsonConversionService` that serializes PDF text, fonts, and
metadata to JSON and rebuilds a PDF from the same structure
- expose REST endpoints for `/pdf/json` and `/json/pdf` conversions
using the existing convert API infrastructure
- define JSON model classes capturing document metadata, font
information, and positioned text elements

## Testing
- `./gradlew spotlessApply` *(fails: plugin
org.springframework.boot:3.5.4 unavailable in build environment)*
- `./gradlew build` *(fails: plugin org.springframework.boot:3.5.4
unavailable in build environment)*

------
https://chatgpt.com/codex/tasks/task_b_68f8e98d94ac8328a0e499e541528b6f

---------

Co-authored-by: EthanHealy01 <[email protected]>

docker/backend/Dockerfile

@@ -28,9 +28,6 @@ FROM alpine:3.22.1@sha256:4bcff63911fcb4448bd4fdacec207030997caf25e9bea4045fa6c8
 # Copy necessary files
 COPY scripts /scripts
 COPY app/core/src/main/resources/static/fonts/*.ttf /usr/share/fonts/opentype/noto/
-# first /app directory is for the build stage, second is for the final image
-COPY --from=build /app/app/core/build/libs/*.jar app.jar
-COPY --from=build /app/build/libs/restart-helper.jar restart-helper.jar
 
 ARG VERSION_TAG
 
@@ -84,6 +81,8 @@ RUN echo "@main https://dl-cdn.alpinelinux.org/alpine/edge/main" | tee -a /etc/a
     gcompat \
     libc6-compat \
     libreoffice \
+    ghostscript \
+    fontforge \
     # pdftohtml
     poppler-utils \
     # OCR MY PDF (unpaper for descew and other advanced features)
@@ -113,11 +112,16 @@ RUN echo "@main https://dl-cdn.alpinelinux.org/alpine/edge/main" | tee -a /etc/a
     chmod +x /scripts/init.sh && \
     # User permissions
     addgroup -S stirlingpdfgroup && adduser -S stirlingpdfuser -G stirlingpdfgroup && \
-    chown -R stirlingpdfuser:stirlingpdfgroup $HOME /scripts /pipeline /usr/share/fonts/opentype/noto /configs /customFiles /pipeline /tmp/stirling-pdf && \
-    chown stirlingpdfuser:stirlingpdfgroup /app.jar /restart-helper.jar
+    chown -R stirlingpdfuser:stirlingpdfgroup $HOME /scripts /pipeline /usr/share/fonts/opentype/noto /configs /customFiles /pipeline /tmp/stirling-pdf
+
+# first /app directory is for the build stage, second is for the final image
+COPY --from=build --chown=stirlingpdfuser:stirlingpdfgroup /app/app/core/build/libs/*.jar /app.jar
+COPY --from=build --chown=stirlingpdfuser:stirlingpdfgroup /app/build/libs/restart-helper.jar /restart-helper.jar
+
+RUN chown stirlingpdfuser:stirlingpdfgroup /app.jar /restart-helper.jar
 
 EXPOSE 8080/tcp
 
 # Set user and run command
 ENTRYPOINT ["tini", "--", "/scripts/init.sh"]
-CMD ["sh", "-c", "java -Dfile.encoding=UTF-8 -Djava.io.tmpdir=/tmp/stirling-pdf -jar /app.jar & /opt/venv/bin/unoserver --port 2003 --interface 127.0.0.1"]
+CMD ["sh", "-c", "java -Dfile.encoding=UTF-8 -Djava.io.tmpdir=/tmp/stirling-pdf -jar /app.jar & /opt/venv/bin/unoserver --port 2003 --interface 127.0.0.1"]

docker/backend/Dockerfile.fat

@@ -74,6 +74,8 @@ RUN echo "@main https://dl-cdn.alpinelinux.org/alpine/edge/main" | tee -a /etc/a
     gcompat \
     libc6-compat \
     libreoffice \
+    ghostscript \
+    fontforge \
     # pdftohtml
     poppler-utils \
     # OCR MY PDF (unpaper for descew and other advanced featues)
@@ -110,4 +112,4 @@ RUN echo "@main https://dl-cdn.alpinelinux.org/alpine/edge/main" | tee -a /etc/a
 EXPOSE 8080/tcp
 # Set user and run command
 ENTRYPOINT ["tini", "--", "/scripts/init.sh"]
-CMD ["sh", "-c", "java -Dfile.encoding=UTF-8 -Djava.io.tmpdir=/tmp/stirling-pdf -jar /app.jar & /opt/venv/bin/unoserver --port 2003 --interface 127.0.0.1"]
+CMD ["sh", "-c", "java -Dfile.encoding=UTF-8 -Djava.io.tmpdir=/tmp/stirling-pdf -jar /app.jar & /opt/venv/bin/unoserver --port 2003 --interface 127.0.0.1"]

docker/backend/Dockerfile.ultra-lite

@@ -60,7 +60,9 @@ RUN echo "@testing https://dl-cdn.alpinelinux.org/alpine/edge/main" | tee -a /et
         curl \
         shadow \
         su-exec \
-        openjdk21-jre && \
+        openjdk21-jre \
+        ghostscript \
+        fontforge && \
     # User permissions
     mkdir -p /configs /logs /customFiles /usr/share/fonts/opentype/noto /tmp/stirling-pdf /pipeline/watchedFolders /pipeline/finishedFolders && \
     chmod +x /scripts/*.sh && \