feat(reject-history): add materialized Pareto aggregate layer with feature-flagged rollout

Pre-compute 6-dimension metric cubes from cached LOT-level DataFrames so
interactive Pareto requests read compact snapshots instead of re-scanning
detail rows on every filter change. Includes single-flight build guard,
TTL/size guardrails, cross-filter exclude-self evaluation, safe legacy
fallback, response metadata exposure, telemetry counters, and a 3-stage
rollout plan (telemetry-only → build-enabled → read-through).

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

data/page_status.json

@@ -30,8 +30,8 @@
       "route": "/reject-history",
       "name": "報廢歷史查詢",
       "status": "released",
-      "drawer_id": "drawer-2",
-      "order": 4
+      "drawer_id": "drawer",
+      "order": 1
     },
     {
       "route": "/wip-detail",
@@ -83,28 +83,28 @@
       "name": "設備維修查詢",
       "status": "released",
       "drawer_id": "drawer",
-      "order": 1
+      "order": 2
     },
     {
       "route": "/query-tool",
       "name": "批次追蹤工具",
       "status": "released",
-      "drawer_id": "drawer",
+      "drawer_id": "drawer-3",
       "order": 2
     },
     {
       "route": "/mid-section-defect",
       "name": "製程不良追溯分析",
       "status": "released",
-      "drawer_id": "drawer",
+      "drawer_id": "drawer-3",
       "order": 3
     },
     {
       "route": "/material-trace",
       "name": "原物料追溯查詢",
       "status": "released",
-      "drawer_id": "drawer",
-      "order": 4
+      "drawer_id": "drawer-3",
+      "order": 3
     },
     {
       "route": "/admin/pages",
@@ -152,6 +152,12 @@
       "name": "歷史報表",
       "order": 2,
       "admin_only": false
+    },
+    {
+      "id": "drawer-3",
+      "name": "追溯工具",
+      "order": 4,
+      "admin_only": false
     }
   ]
 }