feat: 添加 Bedrock API 客户端及 API 层增强

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/services/api/errors.ts

@@ -944,6 +944,9 @@ function get3PModelFallbackSuggestion(model: string): string | undefined {
   // @[MODEL LAUNCH]: Add a fallback suggestion chain for the new model → previous version for 3P
   const m = model.toLowerCase()
   // If the failing model looks like an Opus 4.6 variant, suggest the default Opus (4.1 for 3P)
+  if (m.includes('opus-4-7') || m.includes('opus_4_7')) {
+    return getModelStrings().opus46
+  }
   if (m.includes('opus-4-6') || m.includes('opus_4_6')) {
     return getModelStrings().opus41
   }