feat: add Stream table & boilerplate

src/main/java/com/ddf/vodsystem/services/StreamService.java

@@ -0,0 +1,24 @@
+package com.ddf.vodsystem.services;
+
+import com.ddf.vodsystem.entities.User;
+import com.ddf.vodsystem.repositories.StreamRepository;
+
+public class StreamService {
+    private StreamRepository streamRepository;
+
+    public StreamService(StreamRepository streamRepository) {
+        this.streamRepository = streamRepository;
+    }
+
+    public void startStream(User user) {
+
+    }
+
+    public void endStream(User user) {
+
+    }
+
+    public void heartbeatStream(User user) {
+
+    }
+}