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>

.github/workflows/ci.yml

@@ -48,7 +48,6 @@ jobs:
       matrix:
         app:
           - apps/backend
-          - apps/auth-service
     defaults:
       run:
         working-directory: ${{ matrix.app }}
@@ -83,8 +82,6 @@ jobs:
         service:
           - name: backend
             context: apps/backend
-          - name: auth-service
-            context: apps/auth-service
     steps:
       - name: Checkout
         uses: actions/checkout@v5