Add connection delete/remove command

[Anna-Nevm]

Feature Request

The CLI currently supports one connection add and one connection list but has no way to delete or remove connections.

Use case

When connections accumulate (e.g. duplicate Gmail OAuth connections with |[id] suffixes), there's no CLI path to clean them up. Users have to go to the dashboard manually, which breaks the CLI-first workflow.

Proposed command

one connection delete <connection-key>
one connection rm <connection-key>

Optional flags:

• --force to skip confirmation prompt
• --platform <name> to bulk-delete all connections for a platform

Context

Running one connection list shows 43 duplicate Gmail connections that can't be removed via CLI. The docs at withone.ai/docs also don't reference any delete mechanism.