Initial scaffold: unified customer/insurance/utilities platform

Next.js + NestJS + Prisma (MySQL) monorepo replacing the legacy PHP
internal app. Includes a session-based auth module with Argon2 password
hashing and global input validation (replacing the old app's SQL
injection and plaintext password comparison), the full target Prisma
schema for customers/insurance/utilities/shared ledger/bank register,
Docker Compose + Dockerfiles, and an Access-to-staging migration
pipeline (migration/) already run against the real source databases.

See PLAN.md and RESUME.md for the full architecture and session history.

package.json

@@ -0,0 +1,19 @@
+{
+  "name": "jorgecuadros-platform",
+  "private": true,
+  "workspaces": [
+    "apps/*",
+    "packages/*"
+  ],
+  "scripts": {
+    "dev:web": "npm run dev -w apps/web",
+    "dev:api": "npm run start:dev -w apps/api",
+    "build": "npm run build -ws --if-present",
+    "prisma:generate": "npm run generate -w packages/database",
+    "prisma:migrate": "npm run migrate:dev -w packages/database",
+    "prisma:studio": "npm run studio -w packages/database"
+  },
+  "engines": {
+    "node": ">=20"
+  }
+}