TG-85: restore missing search_limit column to users table

init.sql

@@ -44,6 +44,7 @@ CREATE TABLE IF NOT EXISTS users (
     username VARCHAR(100) UNIQUE NOT NULL,
     password_hash VARCHAR(255) NOT NULL,
     email VARCHAR(255),
+    search_limit VARCHAR(50) DEFAULT '50',
     created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
 ) ENGINE=InnoDB;