added Mercado Pago integration with new payment handling functions and updated app routing

db/migrations/20260114130100_product_embeddings_cache.sql

@@ -0,0 +1,16 @@
+-- migrate:up
+create table if not exists product_embeddings_cache (
+  tenant_id uuid not null references tenants(id) on delete cascade,
+  content_hash text not null,
+  content_text text not null,
+  embedding jsonb not null,
+  model text not null,
+  updated_at timestamptz not null default now(),
+  primary key (tenant_id, content_hash)
+);
+
+create index if not exists product_embeddings_cache_tenant_idx
+  on product_embeddings_cache (tenant_id);
+
+-- migrate:down
+drop table if exists product_embeddings_cache;