Good place to publish funded grant proposals
AFAIK, publishing grant proposals (successful or not) is highly uncommon in the sciences (I've not come across that and don't know of a suitable platform). There is an obvious reason for that: proposals contain new ideas which the applicants plan to pursue in the future, so publishing them invites others to do the same and potentially scoop them.

Ideas are the scientist's capital (in particular for theoretical research) and unless they have a substantial overabundance of good ideas, they must be careful to not give them away too cheaply. Of course, in experimental/applied research an idea must be accompanied by the necessary resources and equipment (i.e. an advantage over any competitor) before it can be successfully pursued.

In your CV, you should list the grants with title, period, and value. However, the proposals themselves are not listed in a CV, they are definitely not publications.