perf: Phase 4+5 optimizations — uploads 10x, downloads 2x, concurrent 2x. moka cache, 512KB buffers, remove sync_all, hash-on-write, preloaded queries, bench.sh v3, gitignore storage/. 500MB upload 12.6s->1.3s (392MB/s). RSS 69-113MB, 0 swap.

src/application/dtos/pagination.rs

@@ -73,11 +73,7 @@ impl PaginationRequestDto {
         }
 
         // Ensure the page size is between 10 and 500
-        if page_size < 10 {
-            page_size = 10;
-        } else if page_size > 500 {
-            page_size = 500;
-        }
+        page_size = page_size.clamp(10, 500);
 
         Self { page, page_size }
     }