feat: extract auth into @marketplaces/auth package, add backoffice admin provisioning spec

- ADR-0001: decision to extract auth/payment into shared @marketplaces/* packages
- Scaffold packages/auth, packages/payment; @marketplaces/auth now holds the real
  telegram (customer+admin QR/session) and ed25519 (future admin challenge/response)
  auth implementation, pushed to sources.vitanova.network/sdarbinyan/vitanovaPackages
- Rewire ~30 call sites to import from @marketplaces/auth; delete migrated originals
  from core/auth, core/admin-auth, services/, models/
- Replace environment coupling with AUTH_API_URL/TELEGRAM_BOT_USERNAME injection
  tokens and isDevMode(); wired as file:packages/auth pending registry publish
- Add TRACK-S §8: bootstrap per-marketplace admin login + marketplace-scoped
  sub-admin invite/role endpoints
- Build, arch:check:boundaries, and full test suite (103/103) all green

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

renovate.json

@@ -0,0 +1,12 @@
+{
+  "$schema": "https://docs.renovatebot.com/renovate-schema.json",
+  "extends": ["config:recommended"],
+  "packageRules": [
+    {
+      "matchPackageNames": ["@marketplaces/auth", "@marketplaces/payment"],
+      "groupName": "marketplaces shared packages",
+      "automerge": false,
+      "labels": ["shared-package-update"]
+    }
+  ]
+}