fix(db): restore whatsappGroups declaration that perf-notes comment ate

A doc-comment refactor in 08f2c0f silently swallowed the
'export const whatsappGroups = pgTable(...)' line and its inner
'{' opening brace, leaving the column properties at top level.
Bot's typecheck happened to pass on a stale build, but the web
container's startup pnpm --filter @cmbot/db build failed with
'Expression expected' / ';' expected at lines 71-77.

Re-add the missing 4 lines. Web is back up.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

packages/db/src/schema.ts

@@ -67,6 +67,9 @@ export const whatsappAccounts = pgTable(
  *                               0002). Powers fuzzy search via the
  *                               `name % term` operator in O(log n).
  */
+export const whatsappGroups = pgTable(
+  "whatsapp_groups",
+  {
     id: uuid("id").primaryKey().defaultRandom(),
     accountId: uuid("account_id").notNull().references(() => whatsappAccounts.id, { onDelete: "cascade" }),
     waGroupJid: text("wa_group_jid").notNull(),