feat: implement secure multi-tenancy, RBAC, and premium dark mode

- Enforced tenant isolation and Role-Based Access Control across all API routes

- Implemented secure profile avatar upload using multer and UUIDs

- Redesigned UI with a premium "Onyx & Gold" Charcoal dark mode

- Added Funnel Stage and Origin filters to Dashboard and User Detail pages

- Replaced "Referral" with "Indicação" across the platform and database

- Optimized Dockerfile and local environment setup for reliable deployments

- Fixed frontend syntax errors and improved KPI/Chart visualizations

package.json

@@ -14,18 +14,21 @@
     "express": "^4.18.2",
     "jsonwebtoken": "^9.0.3",
     "lucide-react": "^0.574.0",
+    "multer": "^2.1.0",
     "mysql2": "^3.9.1",
     "nodemailer": "^8.0.1",
     "react": "^19.2.4",
     "react-dom": "^19.2.4",
     "react-router-dom": "^7.13.0",
-    "recharts": "^3.7.0"
+    "recharts": "^3.7.0",
+    "uuid": "^13.0.0"
   },
   "devDependencies": {
     "@types/bcryptjs": "^2.4.6",
     "@types/jsonwebtoken": "^9.0.10",
     "@types/node": "^22.14.0",
     "@vitejs/plugin-react": "^5.0.0",
+    "dotenv": "^17.3.1",
     "typescript": "~5.8.2",
     "vite": "^6.2.0"
   }