Clarify when parameters should be wrapped in escaped quotes.

[rayruizhiliao]

1. Inside a string (substring interpolation)
   Parameters must always be escaped with quotes, regardless of underlying type.
   Example:

   • "name=\"{{param}}\"" (even if param is a number)

2. Entire value (standalone)
   Parameters must always be escaped with quotes if the parameter type is a string.
   Examples:

   • "\"{{string_param}}\"" ✅
   • "{{string_param}}" ❌