feat: refactor database connection handling and add legacy map loading functionality

- Updated check-connections.mts to use Prisma with PostgreSQL adapter.
- Introduced databaseUrl.ts for resolving database URLs from environment variables.
- Added legacyMapLoader.ts to load and parse legacy map data.
- Implemented scenarioSeeder.ts to seed scenario data into the database.
- Created tests for scenario seeding in scenarioSeeder.test.ts.
- Configured Prisma datasource in prisma.config.ts to support dynamic database URLs.

app/game-engine/package.json

@@ -12,7 +12,9 @@
     },
     "dependencies": {
         "@sammo-ts/common": "workspace:*",
-        "@sammo-ts/logic": "workspace:*"
+        "@sammo-ts/infra": "workspace:*",
+        "@sammo-ts/logic": "workspace:*",
+        "@prisma/client": "^7.2.0"
     },
     "devDependencies": {
         "tsdown": "^0.18.3",