Apps and servers: list or grid view, and drag and drop order #14

Let people choose how they see apps and servers, and order them by hand.

• A switch List | Grid on the Apps and Servers pages (apps today show as a list, servers as cards side by side). The choice is remembered per user.
• Drag and drop to reorder apps and servers, in both views. The order is saved per workspace and used everywhere: sidebar, lists, TUI, CLI output, API and MCP list order.
• Keyboard and touch work too (move up and down without a mouse), and the TUI can reorder with keys.
• Docs: the order and how to change it on every surface.

Wanted soon after the first launch.