Minimal permissions for 'spo site apppermission' commands

We're adding a new Permissions section to all commands. This section will document the minimal delegated and application permissions required to execute the command.

The goal is to:

• Make it easier to run the CLI with custom app registrations and application permissions.
• Ensure we only document the minimal set of permissions needed.
• Keep documentation consistent by placing the Permissions section right before the Examples section.
• If there are multiple resources, order them alphabetically
• If there are commands that only support one type of auth (like delegated or app-only), we have an example for that as well. E.g. m365 planner tenant settings list - Permissions

Resources

• Writing the docs page
• How to document minimal permissions
• Planner example 1
• Planner example 2

Commands in scope

This issue covers the following commands:

• m365 spo site apppermission add
• m365 spo site apppermission get
• m365 spo site apppermission list
• m365 spo site apppermission remove
• m365 spo site apppermission set

Start with the linked writing-the-docs and minimal-permissions guidance, then locate the documentation pages for the five spo site apppermission commands. Add a Permissions section before Examples for each command, documenting minimal delegated and application permissions, ordering multiple resources alphabetically. Done means all five pages follow the referenced format consistently.