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/interfaces/middleware/cache.rs

@@ -48,6 +48,12 @@ pub struct HttpCache {
     default_max_age: u64,
 }
 
+impl Default for HttpCache {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
 impl HttpCache {
     /// Creates a new cache instance
     pub fn new() -> Self {