fix: update @ai-sdk/amazon-bedrock to 3.0.62 for tool streaming support

- Use bedrock.anthropicBeta for Bedrock provider (not additionalModelRequestFields)
- Use top-level headers for direct Anthropic API
- Update @ai-sdk/amazon-bedrock to 3.0.62
- Add headers support to ModelConfig interface

app/api/chat/route.ts

@@ -2,7 +2,7 @@ import { streamText, convertToModelMessages } from 'ai';
 import { getAIModel } from '@/lib/ai-providers';
 import { z } from "zod";
 
-export const maxDuration = 300;
+export const maxDuration = 60;
 
 export async function POST(req: Request) {
   try {
@@ -90,30 +90,7 @@ ${lastMessageText}
 
     // Convert UIMessages to ModelMessages and add system message
     const modelMessages = convertToModelMessages(messages);
-
-    // Log messages with empty content for debugging (helps identify root cause)
-    const emptyMessages = modelMessages.filter((msg: any) =>
-      !msg.content || !Array.isArray(msg.content) || msg.content.length === 0
-    );
-    if (emptyMessages.length > 0) {
-      console.warn('[Chat API] Messages with empty content detected:',
-        JSON.stringify(emptyMessages.map((m: any) => ({ role: m.role, contentLength: m.content?.length })))
-      );
-      console.warn('[Chat API] Original UI messages structure:',
-        JSON.stringify(messages.map((m: any) => ({
-          id: m.id,
-          role: m.role,
-          partsCount: m.parts?.length,
-          partTypes: m.parts?.map((p: any) => p.type)
-        })))
-      );
-    }
-
-    // Filter out messages with empty content arrays (Bedrock API rejects these)
-    // This is a safety measure - ideally convertToModelMessages should handle all cases
-    let enhancedMessages = modelMessages.filter((msg: any) =>
-      msg.content && Array.isArray(msg.content) && msg.content.length > 0
-    );
+    let enhancedMessages = [...modelMessages];
 
     // Update the last message with formatted content if it's a user message
     if (enhancedMessages.length >= 1) {