feat(llm): DeepSeek 适配器默认开启思考模式

请求体含 thinking+reasoning_effort，思考时不下发 temperature；未指定模型时开思考用 deepseek-v4-pro。DEEPSEEK_THINKING=0 可关。

Made-with: Cursor

.env.example

@@ -54,7 +54,11 @@ MA_LLM_TEXT_PROVIDER=crawler_openai_compatible
 # MA_LLM_TEXT_PROVIDER=deepseek
 # DEEPSEEK_API_KEY=sk-...
 # DEEPSEEK_BASE_URL=https://api.deepseek.com/v1
-# DEEPSEEK_TEXT_MODEL=deepseek-chat
+# 思考模式（官方 Thinking Mode，默认开）：关=0；力度 high|max（https://api-docs.deepseek.com/guides/thinking_mode）
+# DEEPSEEK_THINKING=1
+# DEEPSEEK_REASONING_EFFORT=high
+# 未填 DEEPSEEK_TEXT_MODEL 时：开思考默认 deepseek-v4-pro，关思考默认 deepseek-chat
+# DEEPSEEK_TEXT_MODEL=deepseek-v4-pro
 # DEEPSEEK_CONTEXT_WINDOW=64000
 # 别名：DEEPSEEK_MODEL
 # DEEPSEEK_TIMEOUT=600

backend/pipeline/llm/providers/adapters/deepseek_text.py

@@ -5,7 +5,10 @@ DeepSeek 官方 OpenAI 兼容 `chat/completions`（`https://api.deepseek.com`）
 
 启用：`MA_LLM_TEXT_PROVIDER=deepseek`（或 `deep_seek`）。
 
-环境变量：见 `.env.example`（`DEEPSEEK_API_KEY`、基址、模型、上下文字数预检 等）。
+**思考模式**（与官方「Thinking Mode」一致）：默认可通过 `DEEPSEEK_THINKING=0` 关闭。开启时在请求中携带
+`thinking.type=enabled` 与 `reasoning_effort`；不发送 `temperature`（官方在思考模式下忽略采样参数）。
+未指定 `DEEPSEEK_TEXT_MODEL` 时，开启思考默认用 `deepseek-v4-pro`，关闭时默认 `deepseek-chat`。
+详见 https://api-docs.deepseek.com/guides/thinking_mode
 """
 from __future__ import annotations
 
@@ -20,7 +23,8 @@ from pipeline.openai_gateway.estimate import (
 )
 
 _DEFAULT_BASE = "https://api.deepseek.com/v1"
-_DEFAULT_MODEL = "deepseek-chat"
+_DEFAULT_MODEL_NO_THINK = "deepseek-chat"
+_DEFAULT_MODEL_THINK = "deepseek-v4-pro"
 # 常见 64k 级；若用长上下文/官方调整上限可改 DEEPSEEK_CONTEXT_WINDOW
 _DEFAULT_CTX = 64_000
 
@@ -51,6 +55,28 @@ def _read_timeout() -> tuple[float, float]:
     return (conn, float(read))
 
 
+def _thinking_enabled() -> bool:
+    v = (os.environ.get("DEEPSEEK_THINKING") or "1").strip().lower()
+    if v in ("0", "false", "off", "no", "disabled"):
+        return False
+    return True
+
+
+def _reasoning_effort() -> str:
+    raw = (os.environ.get("DEEPSEEK_REASONING_EFFORT") or "high").strip().lower()
+    if raw in ("max", "high", "low", "medium", "xhigh"):
+        if raw in ("low", "medium"):
+            return "high"
+        if raw == "xhigh":
+            return "max"
+        return raw
+    return "high"
+
+
+def _default_model() -> str:
+    return _DEFAULT_MODEL_THINK if _thinking_enabled() else _DEFAULT_MODEL_NO_THINK
+
+
 def _resolve_deepseek_credentials() -> tuple[str, str, str]:
     key = (os.environ.get("DEEPSEEK_API_KEY") or "").strip()
     if not key:
@@ -59,9 +85,9 @@ def _resolve_deepseek_credentials() -> tuple[str, str, str]:
             "与配料/视觉所用 OPENAI_API_KEY 分开配置。"
         )
     base = (os.environ.get("DEEPSEEK_BASE_URL") or _DEFAULT_BASE).strip().rstrip("/")
-    model = (
-        (os.environ.get("DEEPSEEK_TEXT_MODEL") or os.environ.get("DEEPSEEK_MODEL") or _DEFAULT_MODEL)
-    ).strip()
+    model = (os.environ.get("DEEPSEEK_TEXT_MODEL") or os.environ.get("DEEPSEEK_MODEL") or "").strip()
+    if not model:
+        model = _default_model()
     return key, base, model
 
 
@@ -88,15 +114,21 @@ class DeepSeekTextLlm:
         temperature: float | None = None,
     ) -> str:
         api_key, base, model = _resolve_deepseek_credentials()
+        think = _thinking_enabled()
         body: dict[str, Any] = {
             "model": model,
             "messages": [
                 {"role": "system", "content": system_prompt},
                 {"role": "user", "content": user_prompt},
             ],
-            "temperature": _default_temperature() if temperature is None else float(temperature),
             "max_tokens": _WANT_MAX,
         }
+        if think:
+            # 与 OpenAI 官方 Python SDK 合并 extra_body 后一致：思考模式不依赖 temperature
+            body["thinking"] = {"type": "enabled"}
+            body["reasoning_effort"] = _reasoning_effort()
+        else:
+            body["temperature"] = _default_temperature() if temperature is None else float(temperature)
         est = estimate_crawler_style_input_tokens(system_prompt, user_prompt)
         context_window = _context_window()
         if est >= context_window - _BUF - 256:

backend/pipeline/tests/test_text_llm_providers.py

@@ -65,8 +65,13 @@ def test_kimi_complete_text_uses_post_and_returns_content(monkeypatch: pytest.Mo
     assert out == "kimi_out"
 
 
-def test_deepseek_complete_text_uses_post_and_returns_content(monkeypatch: pytest.MonkeyPatch) -> None:
+def test_deepseek_complete_text_uses_post_and_thinking_by_default(
+    monkeypatch: pytest.MonkeyPatch,
+) -> None:
     monkeypatch.setenv("DEEPSEEK_API_KEY", "sk-ds-test")
+    # 默认开思考，未显式设 DEEPSEEK_TEXT_MODEL 时用 deepseek-v4-pro
+    monkeypatch.delenv("DEEPSEEK_TEXT_MODEL", raising=False)
+    monkeypatch.delenv("DEEPSEEK_MODEL", raising=False)
 
     def _fake_post(
         url: str,
@@ -78,6 +83,10 @@ def test_deepseek_complete_text_uses_post_and_returns_content(monkeypatch: pytes
         assert "/chat/completions" in url
         assert json["messages"][0]["role"] == "system"
         assert headers.get("Authorization", "").startswith("Bearer sk-ds-")
+        assert json.get("model") == "deepseek-v4-pro"
+        assert json.get("thinking") == {"type": "enabled"}
+        assert json.get("reasoning_effort") == "high"
+        assert "temperature" not in json
         r = MagicMock()
         r.json.return_value = {"choices": [{"message": {"content": "ds_out"}}]}
         r.raise_for_status = MagicMock()
@@ -92,6 +101,34 @@ def test_deepseek_complete_text_uses_post_and_returns_content(monkeypatch: pytes
     assert out == "ds_out"
 
 
+def test_deepseek_thinking_off_sends_temperature(monkeypatch: pytest.MonkeyPatch) -> None:
+    monkeypatch.setenv("DEEPSEEK_API_KEY", "sk-ds-test")
+    monkeypatch.setenv("DEEPSEEK_THINKING", "0")
+    monkeypatch.setenv("DEEPSEEK_TEXT_MODEL", "deepseek-chat")
+
+    def _fake_post(
+        url: str,
+        headers: dict,
+        json: dict,
+        timeout: object,
+    ) -> MagicMock:
+        assert json.get("model") == "deepseek-chat"
+        assert "thinking" not in json
+        assert "reasoning_effort" not in json
+        assert "temperature" in json
+        r = MagicMock()
+        r.json.return_value = {"choices": [{"message": {"content": "plain"}}]}
+        r.raise_for_status = MagicMock()
+        return r
+
+    with patch(
+        "pipeline.llm.providers.adapters.deepseek_text.requests.post",
+        side_effect=_fake_post,
+    ):
+        out = DeepSeekTextLlm().complete_text("S", "U", temperature=0.0)
+    assert out == "plain"
+
+
 def test_factory_selects_deepseek_when_env_set(monkeypatch: pytest.MonkeyPatch) -> None:
     reset_text_llm_client_for_tests()
     monkeypatch.setenv("MA_LLM_TEXT_PROVIDER", "deepseek")