Plain customer cards

[isshaddad]

• Add Plain customer cards endpoint that returns user account details, organizations, and projects when Plain requests customer information.
• Add impersonate button in customer cards that links to /admin?impersonate={userId} for admin users.
• Update admin route to support GET-based impersonation via query parameter (in addition to existing POST form).
• Testing: Open a Plain thread for a customer; the customer card should appear in the bottom right under account details with the impersonate button visible.

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Latest commit: 5f2fd7b

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[vibe-kanban-cloud]

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