Carry over pre-existing WABA outreach automation WIP

This work already existed uncommitted in the main working tree (not
authored by this branch) and is required as a runtime dependency for the
campaign outreach port (zpro-client, templates, outreach routes/UI). Copied
in as-is, untouched, so this feature branch has a working baseline; the
original uncommitted state in the main checkout is left exactly as it was.

tests/waba-template-library.test.mjs

@@ -0,0 +1,40 @@
+import test from 'node:test';
+import assert from 'node:assert/strict';
+import { openDb, getSetting, setSetting } from '../src/db.mjs';
+import { listWabaTemplateLibrary, syncWabaTemplateLibrary } from '../src/outreach/waba-template-library.mjs';
+
+test('listWabaTemplateLibrary retorna modelos padrao', () => {
+  const db = openDb(':memory:');
+  const templates = listWabaTemplateLibrary(db);
+  assert.ok(templates.some((template) => template.name === 'gti_inicio_atendimento_solicitado'));
+  db.close();
+});
+
+test('syncWabaTemplateLibrary importa templates de resposta do GChat', async () => {
+  const db = openDb(':memory:');
+  setSetting(db, 'gchat.templatesUrl', 'https://gchat.example/templates');
+  const originalFetch = global.fetch;
+  global.fetch = async () => ({
+    ok: true,
+    status: 200,
+    text: async () => JSON.stringify({
+      data: [{
+        name: 'novo_template',
+        language: 'pt_BR',
+        category: 'UTILITY',
+        components: [{ type: 'BODY', text: 'Ola {{1}}, assunto {{2}}' }]
+      }]
+    })
+  });
+  try {
+    const result = await syncWabaTemplateLibrary(db);
+    assert.equal(result.ok, true);
+    assert.equal(result.total, 1);
+  } finally {
+    global.fetch = originalFetch;
+  }
+
+  const saved = JSON.parse(getSetting(db, 'gchat.wabaTemplatesJson'));
+  assert.deepEqual(saved[0].variables, ['{empresa}', '{produto}']);
+  db.close();
+});