feat(drive): permanent deletion per drive

src/application/ports/trash_ports.rs

@@ -19,4 +19,14 @@ pub trait TrashUseCase: Send + Sync {
 
     /// Empty the trash for a specific user
     async fn empty_trash(&self, user_id: Uuid) -> Result<()>;
+
+    /// Empty the trash within a single drive the caller can Delete in.
+    ///
+    /// Same destructive shape as `empty_trash`, but scoped to one drive
+    /// — the Drive group-by on `/trash` exposes a per-row "Empty"
+    /// affordance so multi-drive owners can clear one drive without
+    /// touching the others. Refused (`NotFound`) when the caller has no
+    /// Delete-bearing role on the named drive (anti-enum: same shape
+    /// as if the drive didn't exist), or when the drive id is unknown.
+    async fn empty_trash_for_drive(&self, user_id: Uuid, drive_id: Uuid) -> Result<()>;
 }