Fix: Explicitly set Accept: image/png for Vision core to resolve Link Failure

backend/controllers/ai.js

@@ -156,16 +156,18 @@ exports.chat = asyncHandler(async (req, res, next) => {
         console.log(`[Vision] Projecting via ${apiModelId}...`);
         
         try {
-            const response = await axios.post(
-                `https://router.huggingface.co/hf-inference/models/${apiModelId}`,
-                { inputs: prompt },
-                {
-                    headers: { Authorization: `Bearer ${hfToken}` }, 
-                    responseType: 'arraybuffer',
-                    timeout: 30000 
-                }
-            );
-
+                        const response = await axios.post(
+                            `https://router.huggingface.co/hf-inference/models/${apiModelId}`,
+                            { inputs: prompt },
+                            { 
+                                headers: { 
+                                    Authorization: `Bearer ${hfToken}`,
+                                    'Accept': 'image/png'
+                                }, 
+                                responseType: 'arraybuffer',
+                                timeout: 30000 
+                            }
+                        );
             const filename = `vision-${Date.now()}.png`;
             const filepath = `./public/uploads/${filename}`;
             if (!fs.existsSync('./public/uploads')) fs.mkdirSync('./public/uploads', { recursive: true });