fix: cache calculation

src/router/cache_load.rs

@@ -13,7 +13,7 @@
 
 use crate::cluster::meta_store::MetaStore;
 use crate::instance::Instance;
-use crate::router::{CandidateInfo, RouteDecision, Router};
+use crate::router::{local_l0_scores, CandidateInfo, RouteDecision, Router};
 use crate::trace::RequestRecord;
 
 pub struct CacheLoadRouter;
@@ -39,11 +39,11 @@ impl Router for CacheLoadRouter {
         &mut self,
         req: &RequestRecord,
         instances: &[Instance],
-        meta: &MetaStore,
-        now: f64,
+        _meta: &MetaStore,
+        _now: f64,
     ) -> RouteDecision {
         let n = instances.len();
-        let scores = meta.score_prefix(&req.hash_ids, now, n);
+        let scores = local_l0_scores(req, instances);
 
         // Step 1: least-loaded 1/4 of instances (by queue_len).
         let pool_size = (n / 4).max(2).min(n);
@@ -83,7 +83,7 @@ impl Router for CacheLoadRouter {
             chosen: instances[best_idx].id,
             probe_overhead_s: 0.0,
             candidates,
-            reason: "least-loaded 1/4, then best prefix",
+            reason: "least-loaded 1/4, then best local L0 prefix",
         }
     }
 }