feat: add event and slug proto

proto/events.proto

@@ -0,0 +1,30 @@
+syntax = "proto3";
+
+package events;
+
+option go_package = "./gen";
+
+import "google/protobuf/empty.proto";
+
+service EventService {
+  rpc Subscribe(google.protobuf.Empty) returns (stream Event);
+}
+
+enum EventType {
+  SLUG_CHANGE        = 0;
+}
+
+message Event {
+  EventType type = 1;
+  int64 timestamp_unix_ms = 2;
+
+  oneof data {
+    SlugChangeEvent data_event = 10;
+  }
+}
+
+message SlugChangeEvent {
+  string old = 1;
+  string new = 2;
+}
+

proto/slug.proto

@@ -0,0 +1,19 @@
+syntax = "proto3";
+
+package slug;
+
+option go_package = "./gen";
+
+service Slug {
+  rpc ChangeSlug(ChangeSlugRequest) returns (ChangeSlugResponse);
+}
+
+message ChangeSlugRequest {
+  string old = 1;
+  string new = 2;
+}
+
+message ChangeSlugResponse {
+  bool success = 1;
+  string message = 2;
+}