revert: replace SQLite tracker with JSON backend (v0.6.0) (#32)
* 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)
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