Fix examples and SDK for Immich v2 API compatibility

- Fix AssetUploadStatus serialization to use snake_case (created/duplicate/rejected)
- Fix AssetOrder serialization to use lowercase (asc/desc)
- Add file_created_at/file_modified_at to UploadAssetBuilder
- Fix AddAssetsBuilder response type to Vec<Value> instead of AlbumResponse
- Fix ServerAbout model - version is String not ServerVersion struct
- Update upload_photos.rs to handle duplicate responses correctly
- Update server_info.rs to display new ServerAbout fields
- Update AGENTS.md with new example list

examples/upload_photos.rs

@@ -60,6 +60,7 @@ async fn main() -> Result<(), Box<dyn std::error::Error>> {
     }
 
     // Create an album and add the uploaded asset
+    // Note: For duplicates, the ID is returned even though status is duplicate
     if let Some(asset_id) = result.id {
         let album = client
             .albums()
@@ -68,7 +69,7 @@ async fn main() -> Result<(), Box<dyn std::error::Error>> {
             .execute()
             .await?;
 
-        client
+        let _add_result = client
             .albums()
             .add_assets(album.id)
             .asset_ids([asset_id])