refactor(api): restructured API for type safety, maintainability and docs generation

- These changes makes the API incombatible with previous versions
- Added new types for error handling, success responses, and health checks.
- Updated health check logic to utilize the new types for better clarity and structure.
- Refactored existing handlers to improve response consistency and error handling.
- Updated Makefile to include a new target for generating API types from Swagger.
- Updated "new agent" API to respond an encrypted cert pair

pkg/version.go

@@ -2,7 +2,6 @@ package pkg
 
 import (
 	"fmt"
-	"net/http"
 	"regexp"
 	"strconv"
 	"strings"
@@ -16,12 +15,6 @@ func GetLastVersion() Version {
 	return lastVersion
 }
 
-func GetVersionHTTPHandler() http.HandlerFunc {
-	return func(w http.ResponseWriter, r *http.Request) {
-		fmt.Fprint(w, GetVersion().String())
-	}
-}
-
 func init() {
 	currentVersion = ParseVersion(version)