fix: direct venv python in entrypoint, fix INSIGHTFACE_HOME path, add badges

- entrypoint.sh: replace `uv run` with `/app/.venv/bin/python` to skip
  uv's sync check which was re-downloading ruff and rebuilding the package
  on every container startup
- compose.yml, .env.example: fix INSIGHTFACE_HOME /models → /models/.insightface;
  InsightFace appends models/ to root, so /models produced /models/models/buffalo_l
- README.md: add Immich and Frigate badges from upstream
- CHANGELOG.md, pyproject.toml, uv.lock: bump to 0.2.1

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

.env.example

@@ -33,7 +33,7 @@ FORCE_CPU=false
 ENABLE_CACHE=true
 CACHE_DIR=/app/.if_cache
 HF_HOME=/models/huggingface
-INSIGHTFACE_HOME=/models
+INSIGHTFACE_HOME=/models/.insightface
 
 # ── Tracker overrides (one-shot — remove after use) ───────────────────────────
 # DRY_RUN=true                # Preview selection without downloading/uploading