Refactor tutorial management and add AI image model functionality

- Updated application.properties for local database configuration.
- Introduced DateTimeHelper for timestamp parsing.
- Added MyAIImageModel and MyImageOptions for AI image processing.
- Enhanced Tutorial model to include created and modified timestamps.
- Implemented tutorial editing component with improved UI and functionality.
- Updated user API service to handle tutorial retrieval and updates.
- Refactored tutorials list component to support selection and batch deletion.

jambotron-ui/src/app/user-module/tutorial-edit.component/tutorial-edit.component.scss

@@ -0,0 +1,52 @@
+.submit-form {
+  max-width: 400px;
+  margin: auto;
+}
+
+mat-card{
+  margin: 20px;
+}
+mat-card-title{
+  color: cyan;
+}
+
+.example-form {
+  min-width: 150px;
+  max-width: 500px;
+  width: 100%;
+}
+
+
+.example-full-width {
+  width: 100%;
+}
+
+
+.variable-binding,
+.variable-textarea {
+  width: 49%;
+}
+
+.variable-textarea {
+  border-radius: 5px;
+  box-shadow: 0 1px 2px rgba(0,0,0,.07);
+  min-height: 420px;
+  padding: 8px;
+  transition: all 300ms ease-out;
+}
+
+.variable-textarea:hover {
+  box-shadow: 0 6px 12px 3px rgba(0,0,0,.09),
+  0 2px 3px 1px rgba(0,0,0,.06);
+}
+
+.variable-binding {
+  display: block;
+  float: right;
+}
+
+.preview {
+  /*  display: block;
+    float: right;*/
+}
+