Accept tracked changes before conversion + jodconverter 4.4.9

[rychoo2]

Summary

Adds the ability to accept all tracked changes (redlines) before converting a document, so exported PDFs show the clean "final" view rather than insertion/deletion markup. Also bumps jodconverter 4.4.7 → 4.4.9.

By default LibreOffice preserves tracked changes on export, so a docx with revisions can produce a PDF full of change markup. This adds a JODConverter Filter that dispatches .uno:AcceptAllTrackedChanges on the loaded document before it is stored.

Changes

• AcceptAllTrackedChangesFilter (new) — applies all redlines in-process via .uno:AcceptAllTrackedChanges. Guards on Write.isText(...), so only Writer documents are touched; spreadsheets/presentations pass through untouched. Defensive null checks on context/controller/frame.
• ConverterController — the filter is wired into the LocalConverter builder only when enabled. Enablement is resolved as: per-request acceptTrackedChanges param if present, otherwise the server default.
• application.yml — new jodconverter.accept-tracked-changes (env JODCONVERTER_ACCEPT_TRACKED_CHANGES), default false.
• Versions.kt — jodConverter 4.4.7 → 4.4.9.

Behaviour / compatibility

• Default is false → existing conversions are unchanged (non-breaking).
• Per request: POST /lool/convert-to/pdf?acceptTrackedChanges=true (works on both the param and /{format} path endpoints).
• Globally (fits the Draftable deployment): set JODCONVERTER_ACCEPT_TRACKED_CHANGES=true on the converter container — no change needed in the compare service, which posts to a fixed URL.
• The acceptTrackedChanges param is ignored by ParameterDecoder (doesn't start with its l/lfd/s/sfd prefixes), so it is not mistaken for a load/store property.

Test plan

• Docker build (./gradlew -x test :samples:spring-boot-rest:build) succeeds
• docx with tracked changes → pdf with acceptTrackedChanges=true: markup is gone, revisions applied
• same docx with default (flag omitted, env unset): behaviour unchanged from today
• JODCONVERTER_ACCEPT_TRACKED_CHANGES=true makes it apply without the request param
• non-Writer input (e.g. xlsx/pptx) still converts fine (filter no-ops)

Notes

• No automated test added — exercising the filter requires a running LibreOffice, which the existing lightweight test setup doesn't provide. Verification is manual (above).
• Independent of the security PR Bump Spring Boot to 3.5.16 to remediate app.war CVEs #2; both only touch adjacent lines in Versions.kt and should merge cleanly.

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