feat(pool,scheduling): 号池调度维度、配额冷却机制与管理后台重构

- 新增 scheduling_dimensions 模块，为每个 Key 计算多维调度状态(手动/冷却/熔断/成本/健康)
- 新增 quota_cooldown 模块，统一判定 Key 的有效冷却原因
- Pool 管理后台 API 扩展 Key 详情字段(调度状态/维度/配额/OAuth 信息)
- 前端 Pool 管理页面重写，支持调度状态展示、批量清理封禁 Key
- Handler 基类增加请求调度元数据采集，stream telemetry 增强
- 请求时间线组件增强，支持 attempted 候选展示
- Kiro OAuth 凭证导入解析改进
- 新增 usage 表 provider_key 索引迁移
- 补充调度维度、配额冷却、候选枚举等单元测试

Closes #197

Co-authored-by: AAEE86 <33052466+AAEE86@users.noreply.github.com>

frontend/src/features/pool/components/PoolImportDialog.vue

@@ -1,156 +0,0 @@
-<template>
-  <Dialog
-    :model-value="modelValue"
-    title="批量导入账号"
-    description="以 JSON 格式批量导入 API Key 到号池"
-    size="lg"
-    @update:model-value="emit('update:modelValue', $event)"
-  >
-    <div class="space-y-4">
-      <div class="space-y-1.5">
-        <Label>JSON 数据</Label>
-        <textarea
-          v-model="jsonText"
-          class="w-full h-48 p-3 text-sm font-mono border rounded-lg bg-background resize-none focus:outline-none focus:ring-2 focus:ring-ring"
-          placeholder="[{&quot;name&quot;: &quot;key-01&quot;, &quot;api_key&quot;: &quot;sk-xxx&quot;}, ...]"
-        />
-        <p class="text-xs text-muted-foreground">
-          格式: [{"name": "名称", "api_key": "密钥", "auth_type": "api_key"}]，auth_type 可选
-        </p>
-      </div>
-
-      <div
-        v-if="parseError"
-        class="text-sm text-destructive"
-      >
-        {{ parseError }}
-      </div>
-
-      <div
-        v-if="parsedCount > 0"
-        class="text-sm text-muted-foreground"
-      >
-        已解析 {{ parsedCount }} 个账号
-      </div>
-
-      <div
-        v-if="importResult"
-        class="space-y-1 text-sm"
-      >
-        <p class="text-green-600">
-          成功导入: {{ importResult.imported }}
-        </p>
-        <p
-          v-if="importResult.errors.length > 0"
-          class="text-destructive"
-        >
-          失败: {{ importResult.errors.length }}
-        </p>
-        <div
-          v-for="err in importResult.errors.slice(0, 5)"
-          :key="err.index"
-          class="text-xs text-destructive"
-        >
-          #{{ err.index }}: {{ err.reason }}
-        </div>
-      </div>
-    </div>
-
-    <template #footer>
-      <Button
-        variant="outline"
-        :disabled="loading"
-        @click="emit('update:modelValue', false)"
-      >
-        {{ importResult ? '关闭' : '取消' }}
-      </Button>
-      <Button
-        v-if="!importResult"
-        :disabled="loading || parsedCount === 0"
-        @click="handleImport"
-      >
-        {{ loading ? '导入中...' : `导入 ${parsedCount} 个账号` }}
-      </Button>
-    </template>
-  </Dialog>
-</template>
-
-<script setup lang="ts">
-import { ref, computed, watch } from 'vue'
-import { Dialog, Button, Label } from '@/components/ui'
-import { useToast } from '@/composables/useToast'
-import { parseApiError } from '@/utils/errorParser'
-import { batchImportPoolKeys } from '@/api/endpoints/pool'
-import type { BatchImportResponse, PoolKeyImportItem } from '@/api/endpoints/pool'
-
-const props = defineProps<{
-  modelValue: boolean
-  providerId: string
-}>()
-
-const emit = defineEmits<{
-  'update:modelValue': [value: boolean]
-  imported: []
-}>()
-
-const { error: showError } = useToast()
-const jsonText = ref('')
-const loading = ref(false)
-const parseError = ref('')
-const importResult = ref<BatchImportResponse | null>(null)
-
-const parsedKeys = computed<PoolKeyImportItem[]>(() => {
-  if (!jsonText.value.trim()) return []
-  try {
-    const data = JSON.parse(jsonText.value)
-    if (!Array.isArray(data)) {
-      return []
-    }
-    return data.map((item: Record<string, unknown>) => ({
-      name: String(item.name || ''),
-      api_key: String(item.api_key || ''),
-      auth_type: String(item.auth_type || 'api_key'),
-    }))
-  } catch {
-    return []
-  }
-})
-
-watch(jsonText, (val) => {
-  if (!val.trim()) {
-    parseError.value = ''
-    return
-  }
-  try {
-    const data = JSON.parse(val)
-    parseError.value = Array.isArray(data) ? '' : 'JSON 必须是数组格式'
-  } catch {
-    parseError.value = 'JSON 格式无效'
-  }
-})
-
-const parsedCount = computed(() => parsedKeys.value.length)
-
-watch(() => props.modelValue, (v) => {
-  if (v) {
-    jsonText.value = ''
-    importResult.value = null
-    parseError.value = ''
-  }
-})
-
-async function handleImport() {
-  if (!parsedKeys.value.length) return
-  loading.value = true
-  try {
-    importResult.value = await batchImportPoolKeys(props.providerId, parsedKeys.value)
-    if (importResult.value.imported > 0) {
-      emit('imported')
-    }
-  } catch (err) {
-    showError(parseApiError(err))
-  } finally {
-    loading.value = false
-  }
-}
-</script>