Add public AI prompt templates for websites.

Manage reusable templates in Super Admin, attach editable per-site prompts with Meshkee API public links that require no auth.

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

src/ai-prompts/dto/create-ai-prompt-template.dto.ts

@@ -0,0 +1,12 @@
+import { IsString, MaxLength, MinLength } from 'class-validator';
+
+export class CreateAiPromptTemplateDto {
+  @IsString()
+  @MinLength(1)
+  @MaxLength(255)
+  name!: string;
+
+  @IsString()
+  @MinLength(1)
+  body!: string;
+}