fix: dynamically suggest video tools based on env configuration

server/prompts.mjs

@@ -1,7 +1,20 @@
 // System + user prompt construction for the LLM. Server-side only — the
 // browser never sees these prompts.
 
-export const SYSTEM_PROMPT_ALL = `You are a music production assistant specializing in Suno AI song creation.
+export function getSystemPromptAll() {
+  let tools = 'Runway Gen-3 Alpha, Kling AI, Luma Dream Machine, Pika 2.0, Haiper';
+  const envLinks = process.env.VIDEO_AI_LINKS || '';
+  if (envLinks.trim()) {
+    const names = envLinks.split(',').map(part => {
+      const idx = part.indexOf('=');
+      return idx > 0 ? part.slice(0, idx).trim() : null;
+    }).filter(Boolean);
+    if (names.length > 0) {
+      tools = names.join(', ');
+    }
+  }
+
+  return `You are a music production assistant specializing in Suno AI song creation.
 
 The user will describe a music idea. Generate all song assets as a single JSON
 object. Output ONLY valid JSON — no markdown, no backticks, no preamble.
@@ -49,10 +62,23 @@ REQUIRED JSON STRUCTURE:
 }
 
 Keep each video_prompts[].prompt under 900 characters (excluding the Negative line).
-Recommended video tools (choose the best fit per prompt): Runway Gen-3 Alpha, Kling AI,
-Luma Dream Machine, Pika 2.0, Haiper. Never recommend Sora.`;
+Recommended video tools (choose the best fit per prompt): ${tools}. Never recommend Sora.`;
+}
 
-const SYSTEM_PROMPT_PARTIAL = `You are a music production assistant specializing in Suno AI song creation.
+export function getSystemPromptPartial() {
+  let tools = 'Runway Gen-3 Alpha, Kling AI, Luma Dream Machine, Pika 2.0, Haiper';
+  const envLinks = process.env.VIDEO_AI_LINKS || '';
+  if (envLinks.trim()) {
+    const names = envLinks.split(',').map(part => {
+      const idx = part.indexOf('=');
+      return idx > 0 ? part.slice(0, idx).trim() : null;
+    }).filter(Boolean);
+    if (names.length > 0) {
+      tools = names.join(', ');
+    }
+  }
+
+  return `You are a music production assistant specializing in Suno AI song creation.
 
 The user has an existing song and wants to regenerate ONE section. Output ONLY
 valid JSON — no markdown, no backticks, no preamble.
@@ -80,9 +106,10 @@ QUALITY CONSTRAINTS:
 - style: comma-separated, max 120 words, include tempo + BPM range, never
   name an artist, no "sounds like" phrases.
 - video_prompts: 5-second seamless loops, 16:9. Include the "Negative" line
-  inside each prompt. Keep prompts under 900 characters.
+  inside each prompt. Keep prompts under 900 characters. Recommended tools: ${tools}. Never recommend Sora.
 - youtube_description: follow the hook → description → divider → lyrics →
   divider → CTA → hashtags structure.`;
+}
 
 export const SYSTEM_PROMPT_STYLE_NORMAL = `You are a Suno style-prompt generator.
 
@@ -139,8 +166,8 @@ Rules:
 
 export function buildSystemPrompt(req) {
   if (req.section === 'lyrics_partial') return SYSTEM_PROMPT_LYRICS_PARTIAL;
-  if (req.section === 'all') return SYSTEM_PROMPT_ALL;
-  return SYSTEM_PROMPT_PARTIAL;
+  if (req.section === 'all') return getSystemPromptAll();
+  return getSystemPromptPartial();
 }
 
 export function buildUserMessage(req) {