refactor: remove redundant fields and fix naming in memory stats

Remove duplicate entry counts from MemoryStats (already in parent
StatsResponse), rename process_rss_bytes to process_memory_bytes
to match macOS phys_footprint semantics, drop restating comments.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/api.rs

@@ -214,17 +214,14 @@ struct BlockingStatsResponse {
 #[derive(Serialize)]
 struct MemoryStats {
     cache_bytes: usize,
-    cache_entries: usize,
     blocklist_bytes: usize,
-    blocklist_entries: usize,
     query_log_bytes: usize,
     query_log_entries: usize,
     srtt_bytes: usize,
     srtt_entries: usize,
     overrides_bytes: usize,
-    overrides_entries: usize,
     total_estimated_bytes: usize,
-    process_rss_bytes: usize,
+    process_memory_bytes: usize,
 }
 
 #[derive(Serialize)]
@@ -556,17 +553,14 @@ async fn stats(State(ctx): State<Arc<ServerCtx>>) -> Json<StatsResponse> {
         },
         memory: MemoryStats {
             cache_bytes,
-            cache_entries: cache_len,
             blocklist_bytes,
-            blocklist_entries: bl_stats.domains_loaded,
             query_log_bytes,
             query_log_entries,
             srtt_bytes,
             srtt_entries,
             overrides_bytes,
-            overrides_entries: override_count,
             total_estimated_bytes: total_estimated,
-            process_rss_bytes: crate::stats::process_rss_bytes(),
+            process_memory_bytes: crate::stats::process_memory_bytes(),
         },
     })
 }