ReserveCalifornia provider

User stories

Campers discover California state parks and their campgrounds in the existing search.
Campers monitor available overnight campsites and receive links to the correct booking page.
Operators refresh provider metadata through the existing ingestion worker.

Implement the async BaseProvider interface without importing the legacy CLI.
Use the current Tyler-hosted ReserveCalifornia RDR API, not the retired calirdr.usedirect.com host.
Preserve upstream place, facility, and unit IDs as strings; register provider ID 2.
Interpret scan end_date as check-out, excluding that night; bound grid requests and aggregate dates across responses.
Return only online-bookable, free overnight inventory; exclude blocked, walk-in, locked, and lottery inventory.
Translate provider models to CampsiteDTO, preserving equipment, minimum stays, and raw classification metadata without inventing capacity or electrical hookups.
Refresh parks, campgrounds, and search rows idempotently and keep provider IDs isolated when upstream IDs overlap.
Retire missing records without deleting scans, omit hidden/unbookable records from search, and commit metadata with its search index atomically.
Surface HTTP 200 application rejections as failures and release the actual HTTP connection pool on client shutdown.
Include deterministic synthetic regression fixtures and verify the public API separately; never store reservation identifiers or personal data in fixtures.
Seed the provider through an Alembic data migration and document usage and validation.
Refuse seed rollback while dependent metadata, search rows, or scan targets exist.