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/core.py

@@ -140,7 +140,8 @@ def http_stream_request(
     headers: Optional[Dict[str, str]] = None,
     body: Optional[Any] = None,
     ssl_ctx: Optional[ssl.SSLContext] = None,
-    retries: int = MAX_RETRIES
+    retries: int = MAX_RETRIES,
+    method: str = "POST"
 ) -> TestResult:
     """执行流式 HTTP 请求 (SSE，支持重试)
 
@@ -150,11 +151,12 @@ def http_stream_request(
         body: 请求体 (dict)
         ssl_ctx: SSL 上下文
         retries: 重试次数
+        method: HTTP 方法 (默认 POST)
 
     Returns:
         TestResult 对象
     """
-    req = urllib.request.Request(url, method="POST")
+    req = urllib.request.Request(url, method=method)
     if headers:
         for k, v in headers.items():
             req.add_header(k, v)