This is a Tampermonkey userscript designed to enhance the SMG (Shanghai Media Group) live TV streaming page (kankanews.com). It bypasses playback restrictions by intercepting and rewriting API responses to force programs into a reviewable state, decrypts RSA-encrypted stream URLs, and maintains stream token freshness to prevent interruptions. The script also provides a robust fullscreen implementation with CSS fallback for browsers lacking proper fullscreen API support, and includes recovery mechanisms for playback stalls. It patches the website's Vue.js player component to inject stream addresses, manage program lists, and handle channel changes. The code is self-contained, well-organized, and demonstrates advanced JavaScript patterns for browser extension development, though it is tightly coupled to the target website's API and DOM structure.