refactor: apply clippy auto-fixes (162 warnings resolved)

- Fix needless borrows and references
- Collapse nested if statements
- Replace manual strip_prefix with str::strip_prefix()
- Remove redundant closures in map/unwrap_or_else
- Use Iterator::next_back() instead of rev().next()
- Simplify map_or patterns
- Use std::io::Error::other() instead of new(ErrorKind::Other, ..)
- Use div_ceil() instead of manual ceiling division
- Consolidate format! string arguments
- Various other idiomatic Rust improvements

39 files changed, 220 insertions(+), 320 deletions(-)

src/infrastructure/services/dedup_service.rs

@@ -622,14 +622,13 @@ impl DedupService {
             }
             
             // Check size
-            if let Ok(file_meta) = fs::metadata(&blob_path).await {
-                if file_meta.len() != metadata.size {
+            if let Ok(file_meta) = fs::metadata(&blob_path).await
+                && file_meta.len() != metadata.size {
                     corrupted.push(format!(
                         "{}: size mismatch (expected: {}, actual: {})",
                         hash, metadata.size, file_meta.len()
                     ));
                 }
-            }
         }
         
         if corrupted.is_empty() {