fix: update MiniMax M2 context window to 196_608 for Bedrock

Based on AWS CLI testing, the actual context window limit for MiniMax M2
on Bedrock is 196,608 tokens, not 230,000 as initially configured.

Author: roomote

packages/types/src/providers/bedrock.ts

@@ -453,7 +453,7 @@ export const bedrockModels = {
 	},
 	"minimax.minimax-m2": {
 		maxTokens: 16_384,
-		contextWindow: 230_000,
+		contextWindow: 196_608,
 		supportsImages: false,
 		supportsPromptCache: false,
 		supportsNativeTools: true,