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

db/migrations/20260114130000_product_aliases.sql

@@ -0,0 +1,19 @@
+-- migrate:up
+create table if not exists product_aliases (
+  tenant_id uuid not null references tenants(id) on delete cascade,
+  alias text not null,
+  normalized_alias text not null,
+  woo_product_id integer null,
+  category_hint text null,
+  boost numeric(6,3) not null default 0.0,
+  metadata jsonb not null default '{}'::jsonb,
+  created_at timestamptz not null default now(),
+  updated_at timestamptz not null default now(),
+  primary key (tenant_id, alias)
+);
+
+create index if not exists product_aliases_tenant_norm_idx
+  on product_aliases (tenant_id, normalized_alias);
+
+-- migrate:down
+drop table if exists product_aliases;