fix(attribute): mark ClassConstFetch as lazy to resolve enum attribute args

[yuan-dian]

Bug

When a backed enum value is used as an attribute argument (e.g. #[TableId(IdType::AUTO)]), the compiled binary stores the string backing value instead of the enum instance.

Reproduction:

enum Status: string { case Active = 'active'; }

#[Attribute(Attribute::TARGET_CLASS)]
class ValidateStatus {
    public function __construct(public Status $status = Status::Active) {}
}

#[ValidateStatus(Status::Active)]
class User {}
- PHP mode: ✅ $status is Status enum instance
- Compiled mode: ❌ $status is string "active", throws TypeError
Root Cause
RuntimeAttributeFactoryLowering::requiresLazyValue() did not recognize ClassConstFetch nodes. A factory function was generated (via requiresFactory()), but without the lazy marker the PHPX bridge never invoked it — the arginfo stored the raw string instead of calling php::getEnumCase().
Fix
Add Expr\ClassConstFetch to requiresLazyValue() so the lazy marker is set and the factory is invoked at runtime.
Before: ZVAL_INTERNED_STR(..., "active")
After: typephp_attribute_set_lazy_value_argument(..., factory) → php::getEnumCase("Status", "Active")