Add Member

Add an existing user to a firm.

Note: for now, no invite flow is implemented. The target user must already exist (i.e., be registered in the system).

Allowed roles:

• owner

Required fields:

• email (string)
• role (string) — one of owner | ca_staff | client

Response:

• id (int)
• firm_id (int)
• user_id (int)
• role (string)

Errors:

• 401: Missing/invalid token
• 403: Forbidden
• 404: Firm or user not found
• 409: User is already a member
• 422: Validation error