dsh-1024-game: Add a 1024 Game Panel to DeepSeek Harness

A DSH client plugin maintained by akiwu featuring the 4x4 variant 1024 of 2048 within the Web GUI. Accessed via the left sidebar next to "Plugins," it opens as an independent main panel page rather than an overlay modal. It supports arrow keys/WASD/Touch Swipe and allows undoing up to 32 steps. High scores and game states are saved to `localStorage`. It mounts to two slots: the main panel body and the `sidebar.panellist` icon entry. Keyboard event listeners are active only during mounting. No build step is required; it can be installed using a single line via `github:akiwu/dsh-1024-game` or an offline tarball. The DSH service must be restarted after installation.