feat: add DeepSeek extreme reasoning tier

tests/test_runtime_api.py

@@ -13,6 +13,7 @@ class FakeModelProvider:
     def __init__(self) -> None:
         self.completed = []
         self.forwarded = []
+        self.forward_options = []
 
     async def complete(self, **kwargs):
         self.completed.append(kwargs)
@@ -21,8 +22,9 @@ class FakeModelProvider:
             "usage": {"total_tokens": 10},
         }
 
-    async def forward(self, payload):
+    async def forward(self, payload, **kwargs):
         self.forwarded.append(payload)
+        self.forward_options.append(kwargs)
         request = httpx.Request("POST", "https://model.example.test/v1/chat/completions")
         if payload.get("stream"):
             return httpx.Response(
@@ -83,7 +85,7 @@ def test_model_list_requires_internal_key(settings) -> None:
             headers={"Authorization": f"Bearer {settings.internal_provider_key}"},
         )
         assert response.status_code == 200
-        assert len(response.json()["data"]) == 6
+        assert len(response.json()["data"]) == 8
 
 
 def test_chat_maps_provider_model_and_work_upgrade_is_one_way(settings, identity_jwt) -> None:
@@ -99,6 +101,20 @@ def test_chat_maps_provider_model_and_work_upgrade_is_one_way(settings, identity
         assert provider.forwarded[0]["model"] == "ChatGPT-5.6:Luna"
         assert chat.json()["model"] == "chat-light"
 
+        extreme_chat = client.post(
+            "/v1/chat/completions",
+            headers=headers(settings, identity_jwt, "extreme-chat"),
+            json={"model": "chat-extreme", "messages": [{"role": "user", "content": "think"}]},
+        )
+        assert extreme_chat.status_code == 200
+        assert provider.forwarded[-1]["model"] == "deepseek-v4-pro"
+        assert provider.forward_options[-1] == {
+            "provider": "deepseek",
+            "thinking_enabled": True,
+            "reasoning_effort": "max",
+            "max_output_tokens": 16_384,
+        }
+
         work = client.post(
             "/v1/chat/completions",
             headers=headers(settings, identity_jwt),
@@ -107,6 +123,16 @@ def test_chat_maps_provider_model_and_work_upgrade_is_one_way(settings, identity
         assert work.status_code == 200
         assert provider.completed[-1]["model"] == "ChatGPT-5.6:Sol"
 
+        extreme_work = client.post(
+            "/v1/chat/completions",
+            headers=headers(settings, identity_jwt, "extreme-work"),
+            json={"model": "work-extreme", "messages": [{"role": "user", "content": "do it carefully"}]},
+        )
+        assert extreme_work.status_code == 200
+        assert provider.completed[-1]["model"] == "deepseek-v4-pro"
+        assert provider.completed[-1]["provider"] == "deepseek"
+        assert provider.completed[-1]["reasoning_effort"] == "max"
+
         downgrade = client.post(
             "/v1/chat/completions",
             headers=headers(settings, identity_jwt),