Update default AI prompt and image suggestions

public/web.config

@@ -59,7 +59,7 @@
     <add key="AbacusModel" value="route-llm" />
 
     <!-- Editable prompt template used to generate AI post content -->
-    <add key="AbacusGenerationPrompt" value="You write clear, engaging blog post content for a classic ASP blog. Return only valid JSON with two keys: summary and body. Summary must be 1 to 2 sentences. Body must be 3 to 5 short paragraphs separated by blank lines. Do not use markdown fences, bullets, or code blocks.&#10;&#10;Create blog content for this post title: {TITLE}&#10;Existing summary: {SUMMARY}&#10;Existing body: {BODY}&#10;Keep the title unchanged. Make the content readable and helpful for a general audience." />
+    <add key="AbacusGenerationPrompt" value="You are a panel of 150 expert writers, researchers, editors, and subject-matter specialists on the topic: {TITLE}.&#10;&#10;Your task is to write a long, interesting, useful blog post for a general audience and suggest public domain or CC0 image ideas that would fit the article.&#10;&#10;Return only valid JSON with exactly three keys:&#10;&#10;{&quot;summary&quot;:&quot;&quot;,&quot;body&quot;:&quot;&quot;,&quot;images&quot;:[]}&#10;&#10;Rules:&#10;- Return only valid JSON.&#10;- Do not use markdown fences.&#10;- Do not use bullet points.&#10;- Do not use numbered lists.&#10;- Do not include anything outside the JSON object.&#10;- Keep the title unchanged.&#10;- The summary must be 1 to 2 clear, engaging sentences.&#10;- The body must be 900 to 1,400 words.&#10;- The body should be 8 to 12 short-to-medium paragraphs.&#10;- Separate paragraphs with blank lines.&#10;- Make the writing clear, helpful, and interesting.&#10;- Use a warm, human, conversational tone.&#10;- Avoid sounding like AI-generated content.&#10;- Do not exaggerate or make unsupported claims.&#10;&#10;Image rules:&#10;- Include 3 to 5 image suggestions in the images array.&#10;- Suggest only images that are likely to be available as public domain, CC0, or freely reusable images.&#10;- Prefer image sources such as Wikimedia Commons, Library of Congress, NASA, National Archives, public domain museum collections, or official government archives.&#10;- Do not invent exact image URLs unless they are already provided in the existing content.&#10;- Do not use copyrighted stock photo sites.&#10;- Do not suggest Unsplash as public domain.&#10;- Each image object must include placement, search_query, suggested_source, caption, alt_text, and license_requirement.&#10;- The license_requirement must say: Verify that the image is public domain or CC0 before publishing.&#10;&#10;Use the existing content as source material, but improve it significantly.&#10;&#10;Create blog content for this post title: {TITLE}&#10;Existing summary: {SUMMARY}&#10;Existing body: {BODY}" />
   </appSettings>
 
   <system.webServer>