fix(resource-cache): resolve DataFrame TTL eviction causing empty resource status

_records_from_index() returned [] when process-level DataFrame cache (30s TTL)
expired but derived index remained ready=true. Now reloads from Redis via
_get_cached_data() instead of returning empty.

Also rename /resource page from "機台狀態" to "設備即時概況" in page_status.json.

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

data/page_status.json

@@ -45,7 +45,7 @@
     },
     {
       "route": "/resource",
-      "name": "機台狀態",
+      "name": "設備即時概況",
       "status": "released",
       "drawer_id": "reports",
       "order": 2