Add territory-specific pricing

## Summary
Add pricing for supported territories beyond the current UK monthly pricing shown on the homepage.

## Context
The homepage now shows UK monthly prices only. We need pricing for the other supported markets and should use the existing location middleware to determine the visitor country and display the correct territory pricing.

Supported country paths:
- /us
- /uk
- /au
- /za
- /nz
- /ca
- /ie
- /sg

## Requirements
- Define monthly prices and currency display for each supported territory.
- Use the existing location middleware/country detection flow to select the visitor's pricing territory.
- Fall back to UK pricing when the visitor country cannot be detected.
- Keep pricing copy clear that taxes/VAT/GST may vary by territory.
- Avoid hard-coding UK-only pricing into reusable pricing components once territory pricing is added.

## Notes
Current UK pricing shown on the homepage:
- Launch: £79/mo
- Growth: £249/mo
- Enterprise: From £799/mo

Start by locating the homepage pricing components and the existing location middleware or country-detection entry point. Trace how the current UK pricing is selected, then determine where territory prices and currencies belong. Done means all listed paths select the correct territory pricing, undetected visitors fall back to UK pricing, and the tax/VAT/GST caveat is visible; the issue does not provide the non-UK price values.

Written by the indexing model from the issue text.