feat: 补充 OpenAI 枚举参数和边界越界测试

- service_tier: 补充 flex, priority 测试
- reasoning_effort: 补充 none, minimal 测试
- verbosity: 补充 medium, high 测试
- 边界越界测试: frequency_penalty, presence_penalty, top_p, n
- core.py: http_stream_request 支持 method 参数
- Anthropic: 补充 content_block_start 事件验证

scripts/detect_anthropic.py

@@ -262,6 +262,18 @@ def validate_anthropic_streaming_response(response_text: str) -> Tuple[bool, Lis
         elif event_type == "message_stop":
             has_message_stop = True
 
+        elif event_type == "content_block_start":
+            if "index" not in event:
+                errors.append(f"content_block_start 事件缺少 index 字段")
+            if "content_block" not in event:
+                errors.append(f"content_block_start 事件缺少 content_block 字段")
+            elif not isinstance(event["content_block"], dict):
+                errors.append(f"content_block_start 事件的 content_block 不是对象")
+            else:
+                cb = event["content_block"]
+                if "type" not in cb:
+                    errors.append(f"content_block_start.content_block 缺少 type 字段")
+
         elif event_type == "content_block_delta":
             if "delta" not in event:
                 errors.append(f"content_block_delta 事件缺少 delta 字段")