feat: hide services from top-level

[coladarci]

Summary

• Adds getAllActivities() and getAllAddons() to ProductService — each makes only the one relevant network request instead of fetching both product types
• Exposes every public service method as a top-level short-form on PeekAccessService (e.g. peek.getAllActivities(), peek.getBookingById(), peek.cancelBooking()); all are backwards-compatible — existing get<Resource>Service().<method>() patterns unchanged
• Resource noun prefix used where names would collide (getTimeslotById vs getBookingById, etc.)

Test plan

• peek.getAllActivities() returns activity products only (no add-ons)
• peek.getAllAddons() returns add-on products only
• All existing get<Resource>Service().<method>() call patterns still work unchanged
• 607 tests pass, 100% function coverage, all thresholds above 95%