feat(pool): 引入 pro_first 调度预设、Pool 候选持久化跳过与诊断信息优化

- 新增 pro_first 调度预设（Pro 优先），更新 plus_first 仅针对 Plus 计划，移除 free_team_first
- Pool 内部候选（pool_key_index 不为空）跳过 DB 持久化（available/skipped/unused 均适用）
- LRU 排序新增 catalog_lru_score 回退：runtime 无记录时使用 last_used_at_unix_secs
- 执行路径 miss 诊断消息细化为中文，按 reason 分类输出可读说明
- build_local_request_candidate_status_record 补充 extra_data 和 created_at_unix_ms 字段
- OpenAI CLI 计划构建流程补充候选评估进度跟踪与 terminal reason 设置
- 前端 PoolSchedulingDialog 增加 pro_first 预设展示，修复 LRU 默认预设检测逻辑

apps/aether-gateway/src/tests/control/admin/pool.rs

@@ -187,10 +187,11 @@ async fn gateway_handles_admin_pool_scheduling_presets_locally_with_trusted_admi
     assert_eq!(response.status(), StatusCode::OK);
     let payload: serde_json::Value = response.json().await.expect("json body should parse");
     let items = payload.as_array().expect("payload should be an array");
-    assert_eq!(items.len(), 13);
+    assert_eq!(items.len(), 14);
     assert_eq!(items[0]["name"], "lru");
     assert_eq!(items[1]["name"], "cache_affinity");
-    assert_eq!(items[12]["name"], "team_first");
+    assert_eq!(items[8]["name"], "pro_first");
+    assert_eq!(items[13]["name"], "team_first");
     assert_eq!(*upstream_hits.lock().expect("mutex should lock"), 0);
 
     gateway_handle.abort();