重构: P0-4 IdeaRecord.status union类型化(试点·类型安全)

- types.ts: 新增 IdeaStatus union(draft|pending_review|approved|rejected|promoted|archived, 对齐后端df-types IdeaStatus serde snake_case) + IdeaRecord.status string→IdeaStatus
- Ideas.vue/IdeaDetail.vue/IdeasPanel.vue: statusOptions/statusLabelKey/onStatusChange/emit收窄 类型IdeaStatus(编译期校验拼写错)
- stores/project.ts/state.ts: 比较 IdeaStatus
后端契约: union 6值=df-types IdeaStatus serde, IPC/DB不变零行为变更
P0-4试点跑通: 推广路径验证(union+父子类型传递+emit收窄); 剩余TaskRecord/AiToolCallInfo/WorkflowRecord/ProjectRecord status待推广

src/components/ideas/IdeaDetail.vue

@@ -130,7 +130,7 @@ import { computed } from 'vue'
 import { useI18n } from 'vue-i18n'
 import { parseTags } from '../../stores/knowledge'
 import { useRendered } from '../../composables/useMarkdown'
-import type { IdeaRecord } from '../../api/types'
+import type { IdeaRecord, IdeaStatus } from '../../api/types'
 
 const props = defineProps<{
   idea: IdeaRecord
@@ -138,20 +138,20 @@ const props = defineProps<{
   evalError: string
   promoting: boolean
   deleting: boolean
-  statusOptions: { value: string; labelKey: string }[]
+  statusOptions: { value: IdeaStatus; labelKey: string }[]
 }>()
 
 const emit = defineEmits<{
   (e: 'evaluate'): void
   (e: 'promote'): void
   (e: 'delete'): void
-  (e: 'status-change', value: string): void
+  (e: 'status-change', value: IdeaStatus): void
 }>()
 
 const { t } = useI18n()
 
 // 任意 status 字符串 → 对应 i18n key;未知状态回退到原值显示
-function statusLabelKey(status: string): string {
+function statusLabelKey(status: IdeaStatus): string {
   return props.statusOptions.find(s => s.value === status)?.labelKey ?? status
 }
 
@@ -230,7 +230,7 @@ function sentimentClass(sentiment: number) {
 }
 
 function onStatusChange(e: Event) {
-  emit('status-change', (e.target as HTMLSelectElement).value)
+  emit('status-change', (e.target as HTMLSelectElement).value as IdeaStatus)
 }
 </script>