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>

.gitignore

@@ -77,4 +77,11 @@ playwright/.cache/
 # Desloppify
 desloppify-out/
 .desloppify/
-.opencode
+.opencode
+# Local deploy env files (contain live secrets — never commit)
+*.env
+!*.env.example
+
+# Analysis output
+graphify-out/
+output/