feat: add integration tests for initialization flow

- Implemented end-to-end integration tests covering database reset, bootstrap admin creation, demo user provisioning, scenario installation, and general creation.
- Added support for deterministic seeding and auto admin general creation.
- Created a new package for integration tests with necessary configurations and scripts.
- Updated various modules to support new features, including admin user handling and scenario seeding.
- Enhanced error handling and validation in the join and orchestrator modules.

package.json

@@ -9,6 +9,7 @@
         "lint:fix": "turbo lint:fix",
         "format": "prettier --write .",
         "test": "turbo test",
+        "test:integration": "pnpm --filter @sammo-ts/integration-tests test:integration",
         "build": "turbo build",
         "typecheck": "turbo typecheck",
         "dev": "turbo dev",