fix: Use incremental ID

heromodels/src/models/core/comment.rs

@@ -13,13 +13,10 @@ pub struct Comment {
 }
 
 impl Comment {
-    /// Create a new comment
-    ///
-    /// # Arguments
-    /// * `id` - Optional ID for the comment. If None, the ID will be auto-generated.
-    pub fn new(id: Option<u32>) -> Self {
+    /// Create a new comment with auto-generated ID
+    pub fn new() -> Self {
         Self {
-            base_data: BaseModelData::new(id),
+            base_data: BaseModelData::new(),
             user_id: 0,
             content: String::new(),
         }