Update README.md

README.md

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-  <img src='https://via.placeholder.com/800x220/0f172a/818cf8?text=Next+2.5+(4B)+-+Multimodal+Reasoning' alt='Next 2.5 Banner' style="border-radius: 16px; margin-bottom: 25px; box-shadow: 0 4px 15px rgba(0,0,0,0.2);">
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+  ![next2ultra](https://cdn-uploads.huggingface.co/production/uploads/67d46bc5fe6ad6f6511d6f44/nkLUtS6XkY02YMfiSASTu.png)
 
   <h1 style="color: #6366F1; font-weight: 800; font-size: 2.8em; margin-bottom: 5px; letter-spacing: -1px;">🚀 Next 2.5 (4B)</h1>
   <h3 style="color: #64748b; font-weight: 400; margin-top: 0; font-size: 1.2em;"><i>Türkiye’s Advanced Native Multimodal & Reasoning AI</i></h3>