- ActivitySubscriptions: fix generate/calculateRate querying nonexistent
  `enrollments` table; use `academy_enrollments` with correct columns
- SportsDashboard: fix queries against nonexistent `disciplines` table;
  use `sport_disciplines`
- Sports: unify conversion-fee percentage to a single source
  (MembershipRulesService::getAthleticMemberConversionRules), preventing
  the eligibility preview from drifting from what's actually charged
- SportsActivity: align absence-threshold fallback defaults between
  AttendanceRuleService and TrainingAttendanceService via a shared constant
- SportsActivity: auto-bill first month on Registration Wizard completion,
  matching the direct-enrollment path so wizard-registered players aren't
  left uncharged until the monthly batch runs
- ActivitySubscriptions: guard paySubscription() to only transition
  pending/overdue -> paid, making it idempotent against the (currently
  unreachable) payment.completed listener path
- ActivitySubscriptions: dispatch academy.enrollment_created from the
  enroll wizard so PlayerAffairs' auto-billing listener actually fires

Also adds/updates Architecture Maps for Sports, SportsActivity,
SportsDashboard, ActivitySubscriptions and the cross-module Dependency
Graph, per this repo's mandatory architecture-map workflow.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>