feat: add ESLint flat config, Prettier, dependency-cruiser, and Husky

Setup code quality tooling for the monorepo:
- ESLint 9 flat config with TypeScript, import ordering, and NestJS rules
- Prettier with consistent formatting across all files
- dependency-cruiser enforcing module boundary rules (no cross-module internals, no circular deps)
- Husky + lint-staged for pre-commit hooks
- Auto-fixed existing files for type imports and import ordering

Co-Authored-By: Paperclip <noreply@paperclip.ing>

apps/api/package.json

@@ -7,7 +7,7 @@
     "build": "nest build",
     "start": "node dist/main",
     "start:prod": "node dist/main",
-    "lint": "eslint \"{src,test}/**/*.ts\"",
+    "lint": "eslint src/",
     "test": "vitest run",
     "typecheck": "tsc --noEmit"
   },
@@ -15,7 +15,12 @@
     "@nestjs/common": "^11.0.0",
     "@nestjs/core": "^11.0.0",
     "@nestjs/cqrs": "^11.0.0",
+    "@nestjs/event-emitter": "^3.0.0",
     "@nestjs/platform-express": "^11.0.0",
+    "@prisma/client": "^6.0.0",
+    "ioredis": "^5.4.0",
+    "pino": "^9.0.0",
+    "pino-pretty": "^13.0.0",
     "reflect-metadata": "^0.2.0",
     "rxjs": "^7.8.0"
   },
@@ -26,6 +31,7 @@
     "@types/express": "^5.0.0",
     "@types/node": "^22.0.0",
     "typescript": "^5.7.0",
+    "prisma": "^6.0.0",
     "vitest": "^3.0.0"
   }
 }