fix: prevent duplicate posts by using Ghost API instead of public URL check

- Remove unreliable check_if_post_exists function that checked public URLs
- Replace with get_existing_post_id which properly queries Ghost's Admin API
- This prevents duplicate posts when public URLs are temporarily unavailable

ghost-upload/src/main.rs

@@ -191,16 +191,7 @@ async fn extract_article_content(original_link: &str) -> String {
     }
 }
 
-async fn check_if_post_exists(entry: &Entry) -> bool {
-    let posts_url = "https://notes.ansonbiggs.com/";
-    let link = entry.links.first().unwrap().href.as_str();
-    let slug = get_slug(link);
 
-    match reqwest::get(format!("{}{}", posts_url, slug)).await {
-        Ok(response) => response.status().is_success(),
-        Err(_) => false,
-    }
-}
 
 #[derive(Deserialize, Debug)]
 struct GhostPostsResponse {
@@ -354,7 +345,12 @@ async fn main() {
     } else {
         let post_exists_futures = entries.into_iter().map(|entry| {
             let entry_clone = entry.clone();
-            async move { (entry_clone, check_if_post_exists(&entry).await) }
+            let token_clone = token.clone();
+            async move { 
+                let link = entry.links.first().unwrap().href.as_str();
+                let slug = get_slug(link);
+                (entry_clone, get_existing_post_id(&slug, &token_clone).await.is_some()) 
+            }
         });
 
         let post_exists_results = join_all(post_exists_futures).await;