F3 schema-per-tenant: frontend usa tenantDb() pra tabelas tenant

- useTenantDb composable + lib/supabase/tenantClient (tenantDb/tenantSchemaName)
- tenantStore: getters activeTenantSlug/activeTenantSchema; my_tenants() RPC
  passa a devolver slug+nome (migration 07)
- codemod scripts/codemod-tenant-db.py: supabase.from('<84 tabelas + 6 views
  tenant>') -> tenantDb().from(...) em 139 arquivos (777 chamadas), remove
  .eq('tenant_id') das cadeias tenant (173)
- passada manual (4 agentes): remove tenant_id de payloads insert/upsert/update,
  selects, .or/.is de defaults; onConflict ajustado pros uniques sem tenant_id
  (singletons usam 'singleton'); realtime de tabelas tenant aponta pro schema
  do tenant ativo; repos dropam tenant_id defensivamente de payloads externos
- agendaSelects: tenant_id fora do AGENDA_EVENT_SELECT (quebraria PostgREST)
- zero embeds cross-schema (todos FK embeds sao tenant->tenant ou global->global)
- build de producao passa; 67 .js checados

Pendente (fora do escopo F3, sao cross-tenant/anon -> F4/F6):
- AgendadorPublicoPage (anon, resolve tenant por link_slug)
- Saas{Feriados,NotificationTemplates,DocumentTemplates,Whatsapp}Page
  (gerenciam defaults do sistema / views cross-tenant)

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

src/layout/configuracoes/ConfiguracoesDescontosPage.vue

@@ -17,6 +17,7 @@
 <script setup>
 import { ref, computed, onMounted } from 'vue';
 import { supabase } from '@/lib/supabase/client';
+import { tenantDb } from '@/lib/supabase/tenantClient';
 import { useTenantStore } from '@/stores/tenantStore';
 import { useToast } from 'primevue/usetoast';
 import { usePatientDiscounts } from '@/features/agenda/composables/usePatientDiscounts';
@@ -177,7 +178,7 @@ onMounted(async () => {
         ownerId.value = uid;
         tenantId.value = tenantStore.activeTenantId || null;
 
-        const [, { data: pData }] = await Promise.all([load(uid), supabase.from('patients').select('id, nome_completo').eq('owner_id', uid).eq('status', 'Ativo').order('nome_completo', { ascending: true })]);
+        const [, { data: pData }] = await Promise.all([load(uid), tenantDb().from('patients').select('id, nome_completo').eq('owner_id', uid).eq('status', 'Ativo').order('nome_completo', { ascending: true })]);
 
         patients.value = pData || [];
     } catch (e) {