feat(indexing): add bulk video indexing command and coordinator (#68)

[aimerscrypto]

Closes #68

Summary

Adds bulk indexing capabilities to VidXP for both selected media assets and all eligible catalog items.

Changes

1. Bulk Indexing Coordinator (src/vidxp/bulk_indexing.py):

   • Added run_bulk_index coordinator with BulkIndexItemResult and BulkIndexSummary data models.
   • Paginates catalog records via application.list_media to resolve all eligible items when --all is requested.
   • Inspects active_snapshot.generations to skip previously indexed media unless re-indexing is explicitly forced.
   • Runs indexing sequentially with ApplicationError isolation so single item failures do not halt remaining jobs.
   • Supports progress hooks (on_item_start, on_item_progress, on_item_complete) and --detach queueing.

2. CLI Command (src/vidxp/cli_commands/index.py):

   • Added vidxp index bulk command supporting positional media IDs, --all, --reindex, --detach, --json, and standard index options (--modality, --frame-stride, etc.).
   • Interactive Rich progress tracking and summary table rendering.
   • Emits clean JSON when machine-readable output is requested.
   • Exits with status code 1 if any items fail.

3. Tests (tests/test_bulk_indexing.py):

   • Added 26 unit and CLI tests covering pagination, skip detection, error resilience, forced re-indexing, and Typer runner execution.

Verification

• uv run --with ruff ruff check . passed cleanly.
• uv run --no-sync python -m pytest -q tests/test_bulk_indexing.py passed (26/26 tests).
• Verified input guards, --help, and non-existent media error handling locally.