Add sidecar Qwen VL prompt recommend, fix queued shot bursts, and leave unused MiniMax identity slots empty.

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

server/api/prompt/presets.post.ts

@@ -0,0 +1,15 @@
+import { createPromptPreset, listPromptPresets } from '~/server/utils/promptPresets'
+
+export default defineEventHandler(async (event) => {
+  const body = await readBody<{ name?: string; systemPrompt?: string; description?: string }>(event).catch(() => ({}))
+  const owner = libraryOwnerKey(event)
+  const created = await createPromptPreset(owner, {
+    name: body.name || '',
+    systemPrompt: body.systemPrompt || '',
+    description: body.description
+  })
+  return {
+    preset: created,
+    presets: listPromptPresets(owner)
+  }
+})