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/api/types.ts

@@ -4,11 +4,15 @@
 // 灵感
 // ============================================================
 
+// IdeaRecord.status union 类型 — 值集对齐后端 IdeaStatus serde (df-types/src/types.rs:52)
+// snake_case: draft | pending_review | approved | rejected | promoted | archived
+export type IdeaStatus = 'draft' | 'pending_review' | 'approved' | 'rejected' | 'promoted' | 'archived'
+
 export interface IdeaRecord {
   id: string
   title: string
   description: string
-  status: string // draft | pending_review | approved | rejected | promoted | archived
+  status: IdeaStatus
   priority: number
   score: number | null
   tags: string | null // JSON 数组字符串