feat(contacts): add company field to free contacts

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

shared/schema.ts

@@ -95,6 +95,7 @@ export const contacts = pgTable("contacts", {
   id: serial("id").primaryKey(),
   groupId: integer("group_id").notNull(),
   name: varchar("name").notNull(),
+  company: varchar("company"),
   role: varchar("role"),
   phone: varchar("phone"),
   email: varchar("email"),