feat: introduce address2 and replace address textareas with inputs

[anonymoususer72041]

Summary

Replace textarea-based address fields with single-line <input> fields across the main UI and the careers portal and add “Address Line 2” (address2) support for candidates, contacts, and companies.

Add schema upgrades for existing installations and migrate legacy multi-line address values into address (line 1) and address2 (remaining lines).

Motivation

A large multi-line textarea often implies "enter a full postal block here" while many users (depending on country) expect a single street line. At the same time, international addresses commonly require an additional line (suite/floor/building).

[anonymoususer72041]

It looks like the fix for #356 (merged into develop via #526) never made it into master, so this Pull Request includes the missing id="address" behavior again.

[RussH]

While this cleans up the UI, shrinking the address to a single line breaks formatting for international users (specifically in the UK). Addresses often require multiple lines for Suite/Floor/Business Center details before the street address. I recommend keeping the multi-line support or using a textarea.

[anonymoususer72041]

Thanks for calling this out – agreed that UK/international addresses often need additional lines.

At the same time, there are also regions where a single address line is the norm, so I’d like to avoid presenting a large textarea by default (especially for candidates), since that can imply "write a full postal block here".

Instead of only keeping multi-line addresses as free-form text, I can re-introduce proper "Address Line 2" support end-to-end. On the recruiter-facing side, I’d make Address Line 2 optional. For the careers portal, I’d keep it optional as well, so you can use it in your template if need.

Would you be happy with that approach?

[anonymoususer72041]

If this PR gets merged, #697 will need adjustments