fix: searchable client combobox in Nova instalação

Replaces the native list with a combobox (name/code/CNPJ search, accent- and
case-insensitive, keyboard + mouse, custom dropdown, hidden client_id = the
Gerenciador's real CLIENTE.ID). The backend resolves client_id against the
active GTI_GERENCIADOR mirror and rejects free text/unknown ids. Adds
Tenant.external_cnpj (migration 0025) mirrored via the internal endpoint.

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

release/RELEASE_MANIFEST.json

@@ -1,7 +1,7 @@
 {
  "artifact": "RELEASE_MANIFEST",
  "GTI_FISCAL_VERSION": "1.1.2",
- "generated_at": "2026-09-24T01:54:42+00:00",
+ "generated_at": "2026-09-24T11:12:47+00:00",
  "hub": {
   "version": "1.1.2",
   "api_compat": "1.0",
@@ -17,10 +17,10 @@
   "ICMS_CONTEXT_ENGINE_VERSION": "icms-context-v1"
  },
  "migrations": {
-  "alembic_head_in_repo": "0024_tenant_gerenciador_mirror",
-  "applied_revision": "0024_tenant_gerenciador_mirror",
-  "applied_revision_source": "production Hub 10.0.10.117 (gti-fiscal-hub-fiscal-hub-1), verified 2026-09-24 (fresh DB == upgrade from 0023, pg_dump schema-identical)",
-  "count": 24
+  "alembic_head_in_repo": "0025_tenant_external_cnpj",
+  "applied_revision": "0025_tenant_external_cnpj",
+  "applied_revision_source": "production Hub 10.0.10.117 (gti-fiscal-hub-fiscal-hub-1), verified 2026-09-24",
+  "count": 25
  },
  "datasets_active": [
   {