fix: use lodash.template directly to compile template

[danielroe]

We are going to be removing support for compiling templates from disk using lodash.template in Nuxt v4. This is a PR to move lodash usage directly into the module to avoid breaking it on Nuxt 4.

It would also be possible to avoid using it entirely, which I would strongly recommend, either:

• using a custom function to handle the replacement, such as in fix: remove lodash.template usage nuxt-modules/color-mode#240
• or moving the string interpolation logic directly into getContents

I note that there are a couple of places where you generate the template and consume it later, so it's possible this fix needs to be applied to more addTemplate calls than just the one I've included in the PR. But I hope it's a good start (and advance warning of the change!).

[s00d]

Thank you very much, it's a very important change, I'll study it.