chore: Update Gitea host and Zinit client dependency

- Updated the Gitea host URL in `.roo/mcp.json` and `Cargo.toml`
  to reflect the change from `git.ourworld.tf` to `git.threefold.info`.
- Updated the `zinit-client` dependency in `Cargo.toml` to version
  `0.3.0`.  This ensures compatibility with the updated repository.
- Updated file paths in example files to reflect the new repository URL.

src/virt/nerdctl/cmd.rs

@@ -1,4 +1,4 @@
-// File: /root/code/git.ourworld.tf/herocode/sal/src/virt/nerdctl/cmd.rs
+// File: /root/code/git.threefold.info/herocode/sal/src/virt/nerdctl/cmd.rs
 
 // Basic nerdctl operations for container management
 use std::process::Command;