refactor(pool): 移除调度多维评分详情，简化为 reasons 摘要

移除 scheduling_score、candidate_eligible、scheduling_dimensions 等字段，
前后端统一使用 scheduling_reasons 展示调度状态，精简号池列表信息密度。

frontend/src/api/endpoints/pool.ts

@@ -142,11 +142,6 @@ export interface PoolKeyDetail {
     | string
   scheduling_label?: string
   scheduling_reasons?: PoolSchedulingReason[]
-  scheduling_score?: number
-  candidate_eligible?: boolean
-  scheduling_blocked_count?: number
-  scheduling_degraded_count?: number
-  scheduling_dimensions?: PoolSchedulingDimension[]
 }
 
 export interface PoolSchedulingReason {
@@ -158,18 +153,6 @@ export interface PoolSchedulingReason {
   detail?: string | null
 }
 
-export interface PoolSchedulingDimension {
-  code: string
-  label: string
-  status: 'ok' | 'degraded' | 'blocked' | string
-  blocking: boolean
-  source: 'manual' | 'pool' | 'health' | 'policy' | string
-  weight: number
-  score: number
-  ttl_seconds?: number | null
-  detail?: string | null
-}
-
 export interface PoolKeysPageResponse {
   total: number
   page: number