feat: implement customizable funnel stages per tenant

- Modified attendances.funnel_stage in DB from ENUM to VARCHAR.

- Created tenant_funnels table and backend API routes to manage custom stages.

- Added /admin/funnels page for Admins/Managers to create, edit, order, and color-code their funnel stages.

- Updated Dashboard, UserDetail, and AttendanceDetail to fetch and render dynamic funnel stages instead of hardcoded enums.

- Added defensive checks and logging to GET /users/:idOrSlug to fix sporadic 500 errors during impersonation handoffs.

pages/AttendanceDetail.tsx

@@ -1,13 +1,14 @@
 import React, { useEffect, useState } from 'react';
 import { useParams, Link } from 'react-router-dom';
-import { getAttendanceById, getUserById } from '../services/dataService';
-import { Attendance, User, FunnelStage } from '../types';
+import { getAttendanceById, getUserById, getFunnels } from '../services/dataService';
+import { Attendance, User, FunnelStage, FunnelStageDef } from '../types';
 import { ArrowLeft, CheckCircle2, AlertCircle, Clock, Calendar, MessageSquare, ShoppingBag, Award, TrendingUp } from 'lucide-react';
 
 export const AttendanceDetail: React.FC = () => {
   const { id } = useParams<{ id: string }>();
   const [data, setData] = useState<Attendance | undefined>();
   const [agent, setAgent] = useState<User | undefined>();
+  const [funnelDefs, setFunnelDefs] = useState<FunnelStageDef[]>([]);
   const [loading, setLoading] = useState(true);
 
   useEffect(() => {
@@ -15,8 +16,15 @@ export const AttendanceDetail: React.FC = () => {
       if (id) {
         setLoading(true);
         try {
-          const att = await getAttendanceById(id);
+          const tenantId = localStorage.getItem('ctms_tenant_id') || '';
+          const [att, fDefs] = await Promise.all([
+            getAttendanceById(id),
+            getFunnels(tenantId)
+          ]);
+          
           setData(att);
+          setFunnelDefs(fDefs);
+          
           if (att) {
             const u = await getUserById(att.user_id);
             setAgent(u);
@@ -34,7 +42,10 @@ export const AttendanceDetail: React.FC = () => {
   if (loading) return <div className="p-12 text-center text-zinc-400 dark:text-dark-muted transition-colors">Carregando detalhes...</div>;
   if (!data) return <div className="p-12 text-center text-zinc-500 dark:text-dark-muted transition-colors">Registro de atendimento não encontrado</div>;
 
-  const getStageColor = (stage: FunnelStage) => {
+  const getStageColor = (stage: string) => {
+    const def = funnelDefs.find(f => f.name === stage);
+    if (def) return def.color_class;
+    
     switch (stage) {
       case FunnelStage.WON: return 'text-green-700 bg-green-50 border-green-200 dark:text-green-400 dark:bg-green-900/30 dark:border-green-800';
       case FunnelStage.LOST: return 'text-red-700 bg-red-50 border-red-200 dark:text-red-400 dark:bg-red-900/30 dark:border-red-800';