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/package.json

@@ -0,0 +1,22 @@
+{
+    "name": "@sammo-ts/integration-tests",
+    "private": true,
+    "version": "0.0.0",
+    "type": "module",
+    "scripts": {
+        "test:integration": "vitest run --config vitest.config.ts",
+        "typecheck": "tsc -b"
+    },
+    "dependencies": {
+        "@sammo-ts/common": "workspace:*",
+        "@sammo-ts/game-api": "workspace:*",
+        "@sammo-ts/game-engine": "workspace:*",
+        "@sammo-ts/gateway-api": "workspace:*",
+        "@sammo-ts/infra": "workspace:*",
+        "@trpc/client": "^11.8.1"
+    },
+    "devDependencies": {
+        "vite-tsconfig-paths": "^6.0.3",
+        "vitest": "^4.0.16"
+    }
+}