Add AI service API token auth

internal/httpapi/server.go

@@ -29,6 +29,10 @@ func (s *Server) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 	if path == "" {
 		path = "/"
 	}
+	if !s.requireAPIToken(path, r) {
+		writeError(w, http.StatusUnauthorized, "unauthorized")
+		return
+	}
 	switch {
 	case r.Method == http.MethodGet && path == "/healthz":
 		writeJSON(w, http.StatusOK, map[string]string{"status": "ok"})