Remove .vif file in EC volume destroy matching Go's Destroy()

Go's EcVolume.Destroy() removes .ecx, .ecj, and .vif files. The Rust
version only removed .ecx and .ecj, leaving orphaned .vif files on
disk after EC volume destruction (e.g., after TTL expiry).

seaweed-volume/src/storage/erasure_coding/ec_volume.rs

@@ -768,7 +768,8 @@ impl EcVolume {
             }
             *shard = None;
         }
-        // Remove .ecx/.ecj from ecx_actual_dir (where they were found)
+        // Remove .ecx/.ecj/.vif from ecx_actual_dir (where they were found)
+        // Go's Destroy() removes .ecx, .ecj, and .vif files.
         let actual_base = crate::storage::volume::volume_file_name(
             &self.ecx_actual_dir,
             &self.collection,
@@ -776,10 +777,17 @@ impl EcVolume {
         );
         let _ = fs::remove_file(format!("{}.ecx", actual_base));
         let _ = fs::remove_file(format!("{}.ecj", actual_base));
+        let _ = fs::remove_file(format!("{}.vif", actual_base));
         // Also try the configured idx dir and data dir in case files exist in either
         if self.ecx_actual_dir != self.dir_idx {
             let _ = fs::remove_file(self.ecx_file_name());
             let _ = fs::remove_file(self.ecj_file_name());
+            let idx_base = crate::storage::volume::volume_file_name(
+                &self.dir_idx,
+                &self.collection,
+                self.volume_id,
+            );
+            let _ = fs::remove_file(format!("{}.vif", idx_base));
         }
         if self.ecx_actual_dir != self.dir && self.dir_idx != self.dir {
             let data_base = crate::storage::volume::volume_file_name(
@@ -789,6 +797,7 @@ impl EcVolume {
             );
             let _ = fs::remove_file(format!("{}.ecx", data_base));
             let _ = fs::remove_file(format!("{}.ecj", data_base));
+            let _ = fs::remove_file(format!("{}.vif", data_base));
         }
         self.ecx_file = None;
         self.ecj_file = None;