feat(backend): implement grpc commander, add job dispatcher

backend/internal/models/job.go

@@ -0,0 +1,17 @@
+package models
+
+type Job struct {
+	ID int64
+
+	JobForInsert
+	JobForUpdate
+}
+type JobForInsert struct {
+	Command []string
+	Stdin   *string
+}
+type JobForUpdate struct {
+	Stdout string
+	Stderr string
+	Status int32
+}