Use project vite config for seed.ts

[justinvdm]

Currently worker scripts (used for seed.ts) defines its own vite config, rather than relying on the users own vite config. This means if there is anything the user needs to configure in vite for their seed.ts to work, they don't have a way to configure vite to workt hat way.

We need to change worker scripts to use the project's own vite.config.mts instead.

Links

• @dthyresson running into this issue: https://discord.com/channels/679514959968993311/1375235770993868881/1376271202250788874