Remove rollout restart keybinding and functionality

[clobrano]

Summary

This PR removes the rollout restart feature from the TUI application, including its keybinding configuration, handler implementation, and help documentation.

Key Changes

• Removed RolloutRestart field from the KeyMap struct in internal/tui/keys.go
• Removed the keybinding initialization for rollout restart in NewKeyMap()
• Removed rollout restart from the help menu in FullHelp()
• Removed the "R" key handler and rolloutRestart() call from the Update() method in internal/tui/app.go
• Removed RolloutRestart configuration field from the Keybindings struct in internal/config/config.go
• Removed the default "R" keybinding for rollout restart from internal/config/defaults.go

Implementation Details

The rollout restart functionality was previously bound to the "R" key and appeared in the help menu alongside other resource management operations (terminal, port forward, scale). This change completely removes that capability from the application.

https://claude.ai/code/session_01Mc6T3KydPzjiTjRfDdhk7e