init: hgmj server initial commit

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

web/webg/ai_callback.go

@@ -0,0 +1,14 @@
+package webg
+
+import (
+	"errors"
+	"strings"
+)
+
+// AICallbackURL returns the externally reachable Web callback URL for AI jobs.
+func AICallbackURL(path string) (string, error) {
+	if Conf == nil || strings.TrimSpace(Conf.URL.AiImageToVideoCallbackUrl) == "" {
+		return "", errors.New("ai image-to-video callback url is not configured")
+	}
+	return strings.TrimRight(strings.TrimSpace(Conf.URL.AiImageToVideoCallbackUrl), "/") + "/" + strings.TrimLeft(path, "/"), nil
+}