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/composables/useSessionReminders.js

@@ -11,6 +11,7 @@
 
 import { ref } from 'vue';
 import { supabase } from '@/lib/supabase/client';
+import { tenantDb } from '@/lib/supabase/tenantClient';
 import { useTenantStore } from '@/stores/tenantStore';
 
 const DEFAULTS = {
@@ -38,15 +39,11 @@ export function useSessionReminders() {
         loading.value = true;
         try {
             const [settingsRes, logsRes] = await Promise.all([
-                supabase
-                    .from('session_reminder_settings')
+                tenantDb().from('session_reminder_settings')
                     .select('*')
-                    .eq('tenant_id', tenantId)
                     .maybeSingle(),
-                supabase
-                    .from('session_reminder_logs')
+                tenantDb().from('session_reminder_logs')
                     .select('id, event_id, reminder_type, sent_at, provider, skip_reason, to_phone')
-                    .eq('tenant_id', tenantId)
                     .order('sent_at', { ascending: false })
                     .limit(30)
             ]);
@@ -88,9 +85,8 @@ export function useSessionReminders() {
 
         saving.value = true;
         try {
-            const { error } = await supabase
-                .from('session_reminder_settings')
-                .upsert({ tenant_id: tenantId, ...payload }, { onConflict: 'tenant_id' });
+            const { error } = await tenantDb().from('session_reminder_settings')
+                .upsert({ ...payload }, { onConflict: 'singleton' });
             if (error) throw error;
             return { ok: true };
         } catch (e) {