* refactor: rename CACHE_DIR to DATA_DIR, default path .if_cache → data CACHE_DIR held both the embedding cache and the SQLite tracker DB, making the name misleading. DATA_DIR is more accurate. - Config reads DATA_DIR first; falls back to CACHE_DIR with a deprecation warning so existing setups don't break on upgrade - Default local path: data (was .if_cache) - Docker default path: /app/data (was /app/.if_cache) - Internal references (embeddings.py, upload_tracker.py) updated to DATA_DIR - compose.yml, .env.example, README, wiki, and changelog updated - Version bumped to 0.5.1 * chore: update lockfile --------- Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>
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