init: hgmj server initial commit

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

models/v/recommod/m3u8sign.go

@@ -0,0 +1,10 @@
+package recommod
+
+import "91jd-server/models/v/vidmod"
+
+// SignM3u8 推荐视频列表(/api/app/recommend/vid/list)，供 m3u8ticket 零反射签票。
+func (r VideoListResp) SignM3u8(s vidmod.M3u8Signer) {
+	vidmod.SignM3u8Infos(s, r.VInfos)
+}
+
+var _ vidmod.M3u8Signable = VideoListResp{}