julia

73fcb9d7 - JuliaLowering: Use Core._defaultctors for default constructor generation

JuliaLowering: Use Core._defaultctors for default constructor generation This change aligns JuliaLowering with flisp behavior by using `Core._defaultctors` to generate default constructors at runtime instead of generating constructor code at compile time. Additionally, inner constructors now use `GlobalRef` directly to reference the struct type, eliminating the need for a global declaration in their `scope_block`. This removes the duplicate `declare_global` that was previously emitted for structs with user-defined inner constructors. The `scope_block` for inner constructors is retained to prevent helper functions defined in the struct body from leaking to the module's global scope.