feat: Implement backend API and basic frontend structure

Adds initial backend API endpoints for fetching users and attendances, including basic filtering. Sets up the frontend routing with a layout component and includes placeholder pages for dashboard, users, and login. Refactors the README for local development setup.

types.ts

@@ -0,0 +1,62 @@
+
+export enum FunnelStage {
+  NO_CONTACT = 'Sem atendimento',
+  IDENTIFICATION = 'Identificação',
+  NEGOTIATION = 'Negociação',
+  WON = 'Ganhos',
+  LOST = 'Perdidos',
+}
+
+export interface User {
+  id: string;
+  tenant_id: string;
+  name: string;
+  email: string;
+  avatar_url: string;
+  role: 'super_admin' | 'admin' | 'manager' | 'agent';
+  team_id: string;
+  bio?: string;
+  status: 'active' | 'inactive';
+}
+
+export interface Attendance {
+  id: string;
+  tenant_id: string;
+  user_id: string;
+  created_at: string; // ISO Date
+  summary: string;
+  attention_points: string[];
+  improvement_points: string[];
+  score: number; // 0-100
+  first_response_time_min: number;
+  handling_time_min: number;
+  funnel_stage: FunnelStage;
+  origin: 'WhatsApp' | 'Instagram' | 'Website' | 'LinkedIn' | 'Referral';
+  product_requested: string;
+  product_sold?: string;
+  converted: boolean;
+}
+
+export interface Tenant {
+  id: string;
+  name: string;
+  logo_url?: string;
+  // Extended fields for Super Admin
+  slug?: string;
+  admin_email?: string;
+  status?: 'active' | 'inactive' | 'trial';
+  user_count?: number;
+  attendance_count?: number;
+  created_at?: string;
+}
+
+export interface DateRange {
+  start: Date;
+  end: Date;
+}
+
+export interface DashboardFilter {
+  dateRange: DateRange;
+  userId?: string;
+  teamId?: string;
+}