init: hgmj server initial commit

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

models/v/actmod/web.go

@@ -0,0 +1,16 @@
+package actmod
+
+import (
+	"go.mongodb.org/mongo-driver/bson"
+	"go.mongodb.org/mongo-driver/bson/primitive"
+)
+
+func AddACtivity(act Activity) error {
+	_, err := coll(nil).InsertOne(act)
+	return err
+}
+
+func EidtActivity(actID primitive.ObjectID, b bson.M) error {
+	_, err := coll(nil).UpdateOne(bson.M{"_id": actID}, bson.M{"$set": b})
+	return err
+}