Get seller status

Return only the current seller status for the authenticated account.

Use this lightweight endpoint when you only need status gating (for example: pending vs active) and do not need full seller details.

Behavior:

• Resolves the caller’s seller record and returns a single status field.
• Helpful for fast checks in UI guards and conditional navigation.

Access rules:

• Requires seller authentication.
• Returns 404 if no seller record exists for the user.