No mention of device agent pricing on prices page

### Current Behavior

Customer want to know how much each device agent will cost, no way to find out

### Expected Behavior

Clear pricing for device agents at least for the Teams level.

### Steps To Reproduce

Look at https://flowfuse.com/pricing

### Environment

- Date:
- Platform/OS:
- Browser:

### Have you provided an initial effort estimate for this issue?

I have provided an initial effort estimate

Start at the pricing page linked in the issue and locate the source content that renders it. Add clear device agent pricing, at least for the Teams level, then verify the information is visible at https://flowfuse.com/pricing.

Written by the indexing model from the issue text.