* revert: replace SQLite tracker with JSON backend (v0.6.0)
The SQLite migration (v0.5.0) spawned 21 bug-fix releases in two days:
data-loss risk in the migration layer, schema PK conflicts on per-person
tracking, tracker isolation races under concurrent runs, and a disk-full
error that triggered duplicate Frigate uploads. The complexity cost
outweighs the benefit.
Restored the pre-SQL JSON tracker (frigate_uploaded_ids.json /
frigate_rejected_ids.json in DATA_DIR). Public API is identical — all
callers in executor.py, jobs.py, cli.py, and reconcile.py work unchanged.
Existing JSON files are read automatically; frigate_tracker.db can be
deleted once verified.
* fix: narrow corrupt-thumbnail exception to UnidentifiedImageError; restore IMMICH_URL empty-string fallback
* docs: rewrite v0.6.0 changelog, strip v0.5.x entries, fix README SQLite references
* chore: remove dead get_frigate_filename_for_asset (orphaned since FRIGATE_SCORE_THRESHOLD removal in v0.4.0)
* fix: sort imports in executor.py (ruff I001)
flan
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