chore: correct the option name

Author: nvh0412

db/migrate/20241020010245_add_tool_name_to_ai_tools.rb

@@ -2,7 +2,7 @@
 
 class AddToolNameToAiTools < ActiveRecord::Migration[7.1]
   def up
-    add_column :ai_tools, :tool_name, :string, null: false, max_length: 100, default: "", if_not_exists: true
+    add_column :ai_tools, :tool_name, :string, null: false, limit: 100, default: "", if_not_exists: true
 
     # Migrate existing name to tool_name
     execute <<~SQL