feat: Implement basic API server with mTLS for leader join endpoint

internal/api/router.go

@@ -0,0 +1,48 @@
+package api
+
+import (
+	"net/http"
+	"strings"
+)
+
+// Route represents a single API route
+type Route struct {
+	Method  string
+	Path    string
+	Handler http.HandlerFunc
+}
+
+// Router is a simple HTTP router for the KAT API
+type Router struct {
+	routes []Route
+}
+
+// NewRouter creates a new router instance
+func NewRouter() *Router {
+	return &Router{
+		routes: []Route{},
+	}
+}
+
+// HandleFunc registers a new route with the router
+func (r *Router) HandleFunc(method, path string, handler http.HandlerFunc) {
+	r.routes = append(r.routes, Route{
+		Method:  strings.ToUpper(method),
+		Path:    path,
+		Handler: handler,
+	})
+}
+
+// ServeHTTP implements the http.Handler interface
+func (r *Router) ServeHTTP(w http.ResponseWriter, req *http.Request) {
+	// Find matching route
+	for _, route := range r.routes {
+		if route.Method == req.Method && route.Path == req.URL.Path {
+			route.Handler(w, req)
+			return
+		}
+	}
+
+	// No route matched
+	http.NotFound(w, req)
+}