Update seeds file to reset PKs with new routes for docs

[tvaroglu]

• Changes Implemented:

  • Added PK reset to seeds file, so the /docs don't have to be continuously updated with any reseed
  • Updated /docs to match new endpoint structure (post-removal of Gyms table).

• Quality Control Checklist:

  • [x] Code adheres to Rubocop styling (if unavoidable infractions, please clarify below)
  • [x] 100% SimpleCov test coverage (if below, please clarify below)

• Blockers (if applicable):

• Next Steps & Additional Notes:

  • Reseed db (BE team) and re-record cassettes per new architecture (FE team)