add Layer 2 JRPG component system Add reusable content and window modals, an isolated component sandbox, shared cyberpunk scroll areas, production-safe cache freshness, and server-rendered JRPG panel state. Co-authored-by: Copilot <[email protected]>

#ifndef UVBOOK_PLUGIN_SYSTEM
#define UVBOOK_PLUGIN_SYSTEM

// Plugin authors should use this to register their plugins with mfp.
void mfp_register(const char *name);

#endif