feature: SaaS organization admin

@FangHsin0122 is already working on this.

Since Jun 17, 2026.

Feature: Organization Management
Platform Administrators can review, approve, reject, suspend, and reactivate organizations.
Check the `docs/organization-management.md` for more details.

Scenario: Platform administrator approves organization
Given an organization application is pending review
And I am logged in as a Platform Administrator
When I open the organization review page
And I approve the organization
Then the organization status should become "Active"
And the organization owner should receive a notification

Scenario: Platform administrator rejects organization
Given an organization application is pending review
And I am logged in as a Platform Administrator
When I reject the organization
And I enter a rejection reason
Then the organization status should become "Rejected"
And the organization owner should receive a notification

Scenario: Suspend organization
Given I am a Platform Administrator
And an organization is active
When I suspend the organization
Then all organization users should lose access
And the organization status should become "Suspended"

Scenario: Reactivate organization
Given I am a Platform Administrator
And an organization is suspended
When I reactivate the organization
Then the organization status should become "Active"
And organization users should regain access