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.

tools/integration-tests/vitest.config.ts

@@ -0,0 +1,18 @@
+import path from 'node:path';
+
+import { defineConfig } from 'vitest/config';
+import tsconfigPaths from 'vite-tsconfig-paths';
+
+export default defineConfig({
+    plugins: [
+        tsconfigPaths({
+            projects: [path.resolve(__dirname, '../../tsconfig.paths.json')],
+        }),
+    ],
+    test: {
+        environment: 'node',
+        globals: true,
+        include: ['test/**/*.test.ts'],
+        testTimeout: 120_000,
+    },
+});