[codex] Add Recreation.gov mirror

[Chubi-alt]

Summary

Adds a self-contained recreation_gov WebHarbor mirror for https://www.recreation.gov/.

• Implements the Recreation.gov-style Flask app with search, category browsing, detail pages, OpenStreetMap-backed maps, auth, account creation, saved locations, cart, checkout, reservations, cancellation, reviews, Help Center, articles, and state/popular-location browsing.
• Registers recreation_gov as the next site in websyn_start.sh, control_server.py, and Dockerfile on port 40015.
• Adds 20 WebVoyager-schema tasks covering search/comparison, help/articles, account creation, authenticated state changes, checkout, cancellation, review submission, and booking/cart flows.
• Adds GUIDANCE.md documenting the WebHarbor clone workflow and acceptance requirements.

Seed / Asset Summary

• Facilities: 87
• Reviews: 2,688
• Articles: 13
• Tasks: 20
• HF asset PR: https://huggingface.co/datasets/ChilleD/WebHarbor/discussions/8
• HF asset commit created by PR flow: https://huggingface.co/datasets/ChilleD/WebHarbor/commit/00faedd20a96b4b10d5013a1c07ace9472d7ee80

Validation

• python3 -m py_compile sites/recreation_gov/app.py sites/recreation_gov/seed_data.py
• sites/recreation_gov/tasks.jsonl parsed successfully: 20 tasks, unique IDs
• Local task verification: all 20 tasks passed after per-task reset
• Local reset: POST /reset/recreation_gov returned {"pid":3218,"ready":true,"site":"recreation_gov"}
• Local DB md5 matched: e5e9ce886f044fe7e789b0b15ccecbd7 for both runtime and seed DB
• ./scripts/build.sh webharbor:dev
• Docker smoke test: all sites alive, recreation_gov pages returned 200
• Docker reset: POST /reset/recreation_gov returned {"pid":172,"ready":true,"site":"recreation_gov"}
• Docker DB md5 matched: e5e9ce886f044fe7e789b0b15ccecbd7 for both runtime and seed DB

Reviewer Notes

This PR is draft until the HF asset PR is merged and .assets-revision can be bumped to the merged dataset revision. Screenshot comparison assets can be attached after final review if required.