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/services/recent_service.rs

@@ -19,7 +19,7 @@ impl RecentService {
     pub fn new(repo: Arc<dyn RecentItemsRepositoryPort>, max_recent_items: i32) -> Self {
         Self {
             repo,
-            max_recent_items: max_recent_items.max(1).min(100),
+            max_recent_items: max_recent_items.clamp(1, 100),
         }
     }
 }