Fix bounding box not appearing on /react/encounter after detection

[JasonWildMe]

Summary

Three independent bugs combined to prevent bounding boxes from rendering on /react/encounter after detection completed. Each is fixed in its own commit on this branch.

1. Feature.parameters returned null on cross-PM reads — the JDO mapping used <property> with no backing String field, so DataNucleus' bytecode enhancement persisted the value without invoking the user-defined setParametersAsString on load. The in-memory parameters JSONObject stayed null, getBbox() returned null, and the encounter API serializer emitted boundingBox: [] even though the DB row had correct width/height/x/y JSON.
2. Service worker cached /api/ polling responses — the catchall registerRoute(() => true, new NetworkFirst()) caches every fetch. NetworkFirst falls back to cache on slow/erroring network, so a brief empty-bbox response could be replayed to subsequent polls and even hard refreshes.
3. React polling stopped too early on bulk imports — the polling predicate treated null detectionStatus as terminal, but bulk-imported encounters arrive with detectionStatus = null plus a trivial placeholder annotation while detection is queued in WBIA. Polling stopped on the first poll, never noticed when detection actually completed, and the in-place setMediaAssets mutation prevented useEffects from re-running anyway.

After all three fixes: backend correctly persists and serves bbox data, SW does not cache it, polling stays alive through the WBIA wait, React UI updates without a refresh.

Verified end-to-end by uploading bulk-import encounters on flakebook.wildme.org during this session: bounding boxes now appear automatically once WBIA returns, no manual refresh needed.

Test plan

• Run mvn clean install — build succeeds with new JDO mapping. (Verified locally.)
• Run npm run build in frontend/ — bundle compiles. (Verified locally — eslint clean on changed files.)
• Single-encounter submission: upload an image, observe yellow "Detection in progress" bar, observe red bbox appear automatically when detection completes (no refresh required).
• Bulk-import submission: same as above for each encounter in the import.
• Existing encounters' annotations still render correctly (no regression on already-detected data).
• Legacy/manual encounters without importTaskId and trivial-only annotations don't poll forever (max-poll cap of ~5 minutes serves as a safety net regardless).

Out of scope (separate tickets recommended)

• MediaAsset.derivationMethod uses the same broken <property> pattern as old Feature.parameters. Likely silently broken; nothing user-visible currently depends on it.
• IndexingManager.addIndexingQueueEntry has a dedup race where late updates during a bg index runnable's lifetime are silently dropped.
• BulkImport.doDelete violates MATCHRESULT_FK1 when deleting an import whose annotations are referenced from MATCHRESULT.
• QueueUtil.background halts the entire queue consumer on the first exception in getNext() — recommend catch-and-continue instead.
• Cleaner architectural fix for issue 3 above: have the bulk-import IA dispatch set detectionStatus = "queued"/"sent" server-side instead of leaving it null. Would let us drop the isAwaitingBulkImportDetection workaround.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 82.35294% with 6 lines in your changes missing coverage. Please review.
✅ Project coverage is 51.54%. Comparing base (d6bee0d) to head (d876b05).

Files with missing lines	Patch %	Lines
frontend/src/pages/Encounter/pollingHelpers.js	83.33%	1 Missing and 3 partials ⚠️
...ntend/src/pages/Encounter/stores/EncounterStore.js	0.00%	1 Missing ⚠️
frontend/src/service-worker.js	0.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1559   +/-   ##
=======================================
  Coverage   51.54%   51.54%           
=======================================
  Files         307      308    +1     
  Lines       11942    11952   +10     
  Branches     3836     3842    +6     
=======================================
+ Hits         6155     6161    +6     
- Misses       5502     5503    +1     
- Partials      285      288    +3     

Flag	Coverage Δ
backend	51.54% <82.35%> (+<0.01%)	⬆️
frontend	51.54% <82.35%> (+<0.01%)	⬆️

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[naknomum]

code looks good, problem fixed in testing.