Fix PHPDoc annotations and add PostType NAME constant

[Copilot]

Addresses code review feedback by fixing inconsistent PHPDoc annotations and aligning interface constants.

PHPDoc fixes:

• Removed duplicate @return annotations in PostMeta::type() and TermMeta::type()
• Corrected @var and @return types for Page::$hook_name and Page::get_hook_name() from string to string|false

Interface consistency:

• Added NAME constant to PostType interface to match Taxonomy interface pattern

interface PostType {
    /**
     * Post type name.
     *
     * Implementations are expected to override this.
     */
    public const string NAME = '';
}

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