fix(llm): 删除未实现的 LlmRequest.thinking 字段（CR-H5，YAGNI）

packages/llm_gateway/tests/test_types.py

@@ -0,0 +1,22 @@
+"""C1 类型契约不变量（`LlmRequest` 字段集）单测。"""
+
+from __future__ import annotations
+
+from ww_llm_gateway.adapters.base import Capabilities
+from ww_llm_gateway.types import LlmRequest
+
+
+def test_llm_request_has_no_thinking_field() -> None:
+    # CR-H5：删除从未被任何适配器/网关读取的死字段 `LlmRequest.thinking`（YAGNI）。
+    assert "thinking" not in LlmRequest.model_fields
+    assert set(LlmRequest.model_fields) == {
+        "tier",
+        "input",
+        "system",
+        "stream",
+        "output_schema",
+        "max_tokens",
+        "scope",
+    }
+    # 同名但另一处 live 字段 `Capabilities.thinking`（适配器能力矩阵）不受影响。
+    assert "thinking" in Capabilities.model_fields

packages/llm_gateway/ww_llm_gateway/types.py

@@ -38,7 +38,6 @@ class LlmRequest(BaseModel):
     system: list[Block] = Field(default_factory=list)
     stream: bool = False
     output_schema: type[BaseModel] | None = None
-    thinking: bool = False
     max_tokens: int | None = None
     scope: Scope