Allow `kimi web [PATH]` to create/select a workspace at the given path

What feature would you like to see?

Add an optional positional argument [PATH] to kimi web:

kimi web .                  # use the current directory as the workspace
kimi web ~/projects/foo     # use the given directory as the workspace

• A relative [PATH] is resolved against the cwd where the command runs (kimi web . = current directory).
• When the web UI opens, it automatically creates (if missing) and selects the workspace at that path as the default workspace for this launch, instead of restoring the most recent session's workspace.
• Omitting [PATH] keeps the current behavior unchanged (fully backward compatible).
• Mirrors the familiar code . / cursor . convention, lowering the friction of moving from the terminal to the web UI.

Use case

After cd-ing into a project in the terminal, a single kimi web . opens the browser already scoped to that project, with no manual directory picking in the web UI.

Additional information

No response

Start at the entry point for the kimi web command and trace how it restores or selects the workspace when the web UI opens. Add optional path handling with cwd-relative resolution, creation when missing, and selection for that launch; verify that kimi web without a path retains existing behavior and that both relative and explicit paths open the expected workspace.