refactor(db): replace sqlc with handwritten pgx repos

- Finish Paddle-to-Stripe billing migration; drop paddle/stripe libs
- Renumber migrations; add 00012 memberships+manage_token,
  00013 location_type_capacity
- Add tests: admin, auth, bookings customer service
- Remove graphify-out artifacts and stale env files

Authored By: TDvorak <[email protected]>

Generated with [Devin](https://devin.ai)

Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com>

apps/backend/internal/db/services.go

@@ -1,8 +1,8 @@
 package db
 
 import (
-"context"
-"time"
+	"context"
+	"time"
 )
 
 func (r *PGRepository) ListServicesByTenant(ctx context.Context, tenantID string) ([]ServiceRecord, error) {