feat: multi-style support in covers.js and postImages.js

covers.js: image_style CSV → random pick per generation
postImages.js: image_style CSV → random pick per generation

src/services/covers.js

@@ -100,7 +100,12 @@ Wide 16:9 format. No text, no letters, no logos, no identifiable real human face
 
   let styleDesc, paletteDesc, moodDesc, compositionDesc;
 
-  const csStyle = channelStyle?.image_style;
+  // Если задано несколько стилей через запятую — берём случайный из них
+  const rawStyle = channelStyle?.image_style || '';
+  const styleList = rawStyle.split(',').map(s => s.trim()).filter(s => s && s !== 'auto');
+  const csStyle = styleList.length > 0
+    ? styleList[Math.floor(Math.random() * styleList.length)]
+    : null;
   const STYLE_MAP = {
     'realistic-photo': { style: 'photorealistic, high-quality photography, natural lighting, sharp focus, realistic textures', mood: 'professional, realistic', comp: 'rule of thirds, natural depth of field' },
     'flat-illustration': { style: 'flat vector illustration, clean geometric shapes, modern editorial style, smooth gradients, minimal', mood: 'clean, modern', comp: 'balanced, centered focal point' },

src/services/postImages.js

@@ -63,7 +63,11 @@ const IMAGE_PALETTES = {
  * Генерирует картинку к посту через GPT-5 /v1/responses + image_generation.
  */
 async function generatePostImage({ post, channel, style = {} }) {
-  const imageStyle = IMAGE_STYLES[style.image_style] || IMAGE_STYLES['flat-illustration'];
+  // Если задано несколько стилей через запятую — случайно выбираем один
+  const styleList = (style.image_style || 'flat-illustration')
+    .split(',').map(s => s.trim()).filter(s => s && s !== 'auto');
+  const pickedStyle = styleList[Math.floor(Math.random() * styleList.length)] || 'flat-illustration';
+  const imageStyle = IMAGE_STYLES[pickedStyle] || IMAGE_STYLES['flat-illustration'];
   const palette = style.image_custom_colors
     ? `custom brand palette: ${style.image_custom_colors}`
     : IMAGE_PALETTES[style.image_palette] || '';