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>

database-novo/migrations/20260612000007_f3_my_tenants_slug.sql

@@ -0,0 +1,33 @@
+-- =============================================================================
+-- F3 — my_tenants() passa a devolver slug (e nome) do tenant
+--
+-- O frontend resolve o schema físico do tenant ativo no cliente:
+-- tenantStore guarda memberships de my_tenants(); slug -> 'tenant_<slug>'.
+-- Campo extra é inofensivo pro frontend atual (main) que ignora colunas novas.
+-- (mudança de RETURNS TABLE exige DROP + CREATE)
+-- =============================================================================
+
+BEGIN;
+
+DROP FUNCTION IF EXISTS public.my_tenants();
+
+CREATE FUNCTION public.my_tenants()
+ RETURNS TABLE(tenant_id uuid, role text, status text, kind text, slug text, tenant_name text)
+ LANGUAGE sql
+ STABLE
+AS $function$
+  select
+    tm.tenant_id,
+    tm.role,
+    tm.status,
+    t.kind,
+    t.slug,
+    t.name
+  from public.tenant_members tm
+  join public.tenants t on t.id = tm.tenant_id
+  where tm.user_id = auth.uid();
+$function$;
+
+GRANT EXECUTE ON FUNCTION public.my_tenants() TO authenticated;
+
+COMMIT;