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

constants.ts

@@ -111,7 +111,7 @@ export const USERS: User[] = [
 ];
 
 const generateMockAttendances = (count: number): Attendance[] => {
-  const origins = ['WhatsApp', 'Instagram', 'Website', 'LinkedIn', 'Referral'] as const;
+  const origins = ['WhatsApp', 'Instagram', 'Website', 'LinkedIn', 'Indicação'] as const;
   const stages = Object.values(FunnelStage);
   const products = ['Plano Premium', 'Plano Básico', 'Suíte Enterprise', 'Consultoria'];
   
@@ -163,9 +163,36 @@ export const MOCK_ATTENDANCES = generateMockAttendances(300);
 // Visual Constants
 export const COLORS = {
   primary: '#facc15', // Yellow-400
-  secondary: '#1e293b', // Slate-800
-  success: '#22c55e',
-  warning: '#f59e0b',
-  danger: '#ef4444',
-  charts: ['#3b82f6', '#10b981', '#6366f1', '#f59e0b', '#ec4899', '#8b5cf6'],
+  secondary: '#18181b', // Zinc-900
+  success: '#10b981', // Emerald-500
+  warning: '#f59e0b', // Amber-500
+  danger: '#ef4444', // Red-500
+  
+  // Prettier, modern SaaS palette for general charts
+  charts: [
+    '#818cf8', // Soft Indigo
+    '#4ade80', // Soft Emerald
+    '#fb923c', // Soft Orange
+    '#22d3ee', // Soft Cyan
+    '#f472b6', // Soft Pink
+    '#a78bfa'  // Soft Violet
+  ],
+
+  // Brand-specific colors for Lead Origins
+    origins: {
+    'WhatsApp': '#25D366',
+    'Instagram': '#E4405F',
+    'LinkedIn': '#0077B5',
+    'Website': '#f87171', // Coral Red (Distinct from LinkedIn blue)
+    'Indicação': '#f59e0b'
+  },
+
+  // Semantic palette for Funnel Stages
+  funnel: {
+    'Sem atendimento': '#64748b', // Slate-500
+    'Identificação': '#818cf8',   // Indigo-400
+    'Negociação': '#fb923c',     // Orange-400
+    'Ganhos': '#10b981',         // Emerald-500
+    'Perdidos': '#f87171'        // Red-400
+  }
 };