Api: generate routes & handlers from api spec

[practicalli-johnny]

Research the options for generating code for routes and (mock) handlers, given an API specification file, e.g. swagger.json

Add specifications to support type checking of request & response data (clojure spec /malli)

Research

Clojurians Slack discussions:

• https://clojurians.slack.com/archives/C03S1KBA2/p1756846032848709?thread_ts=1756846032.848709&cid=C03S1KBA2