feat: add XMP writer plugin and enhance media upload configuration

libertas_worker/src/plugins/xmp_writer.rs

@@ -0,0 +1,54 @@
+use std::path::PathBuf;
+
+use async_trait::async_trait;
+use libertas_core::{
+    error::{CoreError, CoreResult},
+    models::Media,
+    plugins::{MediaProcessorPlugin, PluginContext, PluginData},
+};
+use tokio::fs;
+use xmp_toolkit::XmpMeta;
+
+pub struct XmpWriterPlugin;
+
+#[async_trait]
+impl MediaProcessorPlugin for XmpWriterPlugin {
+    fn name(&self) -> &'static str {
+        "xmp_writer"
+    }
+
+    async fn process(&self, media: &Media, context: &PluginContext) -> CoreResult<PluginData> {
+        let fresh_media = context
+            .media_repo
+            .find_by_id(media.id)
+            .await?
+            .ok_or(CoreError::NotFound("Media".to_string(), media.id))?;
+
+        let file_path = PathBuf::from(&context.media_library_path).join(&fresh_media.storage_path);
+        let xmp_path = format!("{}.xmp", file_path.to_string_lossy());
+
+        let mut xmp = XmpMeta::new()
+            .map_err(|e| CoreError::Unknown(format!("Failed to create new XMP metadata: {}", e)))?;
+
+        xmp.set_property(
+            "http://purl.org/dc/elements/1.1/",
+            "description",
+            &fresh_media.original_filename.into(),
+        )
+        .map_err(|e| {
+            CoreError::Unknown(format!("Failed to set description property in XMP: {}", e))
+        })?;
+
+        if let Some(_location) = &fresh_media.extracted_location {
+            // TODO: Set location properties in XMP
+        }
+
+        let xmp_str = xmp.to_string();
+
+        fs::write(&xmp_path, xmp_str).await?;
+
+        Ok(PluginData {
+            message: "XMP sidecar written successfully.".to_string(),
+        })
+    }
+}