feat(ECR-021): AICoreConfig SystemPrompt 只读并 Closed

新增 system_prompts 目录、admin.ai_config.read 与 admin-h5「AI」页；本切片不改运行时 Prompt、禁写发布/UGC/真支付。

Co-authored-by: Cursor <cursoragent@cursor.com>

apps/admin-h5/src/api/client.ts

@@ -295,6 +295,32 @@ export const adminApi = {
       rating: number
       source: string
     }>('POST', `/ask/threads/${threadId}/feedback`, body),
+  systemPrompts: () =>
+    request<{
+      items: Array<{
+        id: string
+        code: string
+        title: string
+        scene?: string
+        body: string
+        version: number
+        active: boolean
+        system: boolean
+        updated_at: string
+      }>
+    }>('GET', '/ai/system-prompts'),
+  systemPrompt: (id: string) =>
+    request<{
+      id: string
+      code: string
+      title: string
+      scene?: string
+      body: string
+      version: number
+      active: boolean
+      system: boolean
+      updated_at: string
+    }>('GET', `/ai/system-prompts/${id}`),
   orders: () =>
     request<{
       items: Array<{