fix: Add retry logic for OpenRouter 429 rate limit errors

- Retries up to 3 times with exponential backoff (2s, 4s, 8s)
- Also handles 503 service unavailable errors
- Logs retry attempts for debugging
- Only retries rate limit errors, other errors fail immediately

src/app/actions/gemini-vision.ts

@@ -71,50 +71,82 @@ Respond ONLY with valid JSON in this format:
   "confidence": 0.85
 }`;
 
+/**
+ * Sleep helper for retry delays
+ */
+function sleep(ms: number): Promise<void> {
+    return new Promise(resolve => setTimeout(resolve, ms));
+}
+
 /**
  * Analyze whisky label with OpenRouter (Gemma 3 27B)
+ * Includes retry logic for 429 rate limit errors
  */
 async function analyzeWithOpenRouter(base64Data: string, mimeType: string): Promise<{ data: any; apiTime: number }> {
     const client = getOpenRouterClient();
     const startApi = performance.now();
+    const maxRetries = 3;
+    let lastError: any = null;
 
-    const response = await client.chat.completions.create({
-        model: OPENROUTER_VISION_MODEL,
-        messages: [
-            {
-                role: 'user',
-                content: [
+    for (let attempt = 1; attempt <= maxRetries; attempt++) {
+        try {
+            const response = await client.chat.completions.create({
+                model: OPENROUTER_VISION_MODEL,
+                messages: [
                     {
-                        type: 'image_url',
-                        image_url: {
-                            url: `data:${mimeType};base64,${base64Data}`,
-                        },
-                    },
-                    {
-                        type: 'text',
-                        text: VISION_PROMPT,
+                        role: 'user',
+                        content: [
+                            {
+                                type: 'image_url',
+                                image_url: {
+                                    url: `data:${mimeType};base64,${base64Data}`,
+                                },
+                            },
+                            {
+                                type: 'text',
+                                text: VISION_PROMPT,
+                            },
+                        ],
                     },
                 ],
-            },
-        ],
-        temperature: 0.1,
-        max_tokens: 1024,
-    });
+                temperature: 0.1,
+                max_tokens: 1024,
+            });
 
-    const endApi = performance.now();
-    const content = response.choices[0]?.message?.content || '{}';
+            const endApi = performance.now();
+            const content = response.choices[0]?.message?.content || '{}';
 
-    // Extract JSON from response (may have markdown code blocks)
-    let jsonStr = content;
-    const jsonMatch = content.match(/```(?:json)?\s*([\s\S]*?)```/);
-    if (jsonMatch) {
-        jsonStr = jsonMatch[1].trim();
+            // Extract JSON from response (may have markdown code blocks)
+            let jsonStr = content;
+            const jsonMatch = content.match(/```(?:json)?\s*([\s\S]*?)```/);
+            if (jsonMatch) {
+                jsonStr = jsonMatch[1].trim();
+            }
+
+            return {
+                data: JSON.parse(jsonStr),
+                apiTime: endApi - startApi,
+            };
+
+        } catch (error: any) {
+            lastError = error;
+            const status = error?.status || error?.response?.status;
+
+            // Only retry on 429 (rate limit) or 503 (service unavailable)
+            if (status === 429 || status === 503) {
+                const delay = Math.pow(2, attempt) * 1000; // 2s, 4s, 8s
+                console.log(`[OpenRouter] Rate limited (${status}), retry ${attempt}/${maxRetries} in ${delay}ms...`);
+                await sleep(delay);
+                continue;
+            }
+
+            // Other errors - don't retry
+            throw error;
+        }
     }
 
-    return {
-        data: JSON.parse(jsonStr),
-        apiTime: endApi - startApi,
-    };
+    // All retries exhausted
+    throw lastError || new Error('OpenRouter request failed after retries');
 }
 
 /**

src/lib/openrouter.ts

@@ -37,4 +37,4 @@ export function getOpenRouterClient(): OpenAI {
 }
 
 // Default OpenRouter model for vision tasks
-export const OPENROUTER_VISION_MODEL = 'google/gemma-3-27b-it';
+export const OPENROUTER_VISION_MODEL = 'google/gemma-3-27b-it:free';