fix: use pnpm exec tsx for monorepo module resolution

apps/api/package.json

@@ -5,7 +5,7 @@
     "scripts": {
         "dev": "tsx watch src/index.ts",
         "build": "tsc --build",
-        "start": "node dist/index.js",
+        "start": "pnpm exec tsx src/index.ts",
         "test": "vitest run",
         "test:ai": "vitest run test/regression/ai-pedagogy.test.ts",
         "test:watch": "vitest"

apps/whatsapp-worker/package.json

@@ -5,7 +5,7 @@
     "scripts": {
         "dev": "tsx watch src/index.ts",
         "build": "pnpm --filter @repo/database generate && tsc --build",
-        "start": "node dist/index.js",
+        "start": "pnpm exec tsx src/index.ts",
         "test": "vitest run"
     },
     "dependencies": {