feat: add Claude subagent model config (#4830)

* feat: add Claude subagent takeover config

* feat: add Claude subagent model field

* i18n: add Claude subagent model labels

* fix(proxy): preserve configured subagent model mapping

* fix(providers): exclude subagent model from Claude common config

* style: format rust code

tests/components/ClaudeFormFields.test.tsx

@@ -85,6 +85,7 @@ const renderCopilotForm = (overrides: Partial<ClaudeFormFieldsProps> = {}) => {
     defaultOpusModelName: "",
     defaultFableModel: "",
     defaultFableModelName: "",
+    subagentModel: "",
     onModelChange: vi.fn(),
     speedTestEndpoints: [],
     apiFormat: "anthropic",
@@ -173,4 +174,25 @@ describe("ClaudeFormFields", () => {
       );
     });
   });
+
+  it("一键设置会同时写入 Subagent 模型", () => {
+    const onModelChange = vi.fn();
+    renderCopilotForm({
+      claudeModel: "shared-model[1M]",
+      defaultSonnetModel: "",
+      defaultSonnetModelName: "",
+      onModelChange,
+    });
+
+    fireEvent.click(
+      screen.getByRole("button", {
+        name: "一键设置",
+      }),
+    );
+
+    expect(onModelChange).toHaveBeenCalledWith(
+      "CLAUDE_CODE_SUBAGENT_MODEL",
+      "shared-model[1M]",
+    );
+  });
 });

tests/hooks/useModelState.test.tsx

@@ -17,6 +17,7 @@ describe("useModelState", () => {
         ANTHROPIC_DEFAULT_SONNET_MODEL_NAME: "DeepSeek V4 Pro",
         ANTHROPIC_DEFAULT_OPUS_MODEL: "kimi-k2",
         ANTHROPIC_DEFAULT_OPUS_MODEL_NAME: "Kimi K2",
+        CLAUDE_CODE_SUBAGENT_MODEL: "subagent-model[1M]",
       },
     });
 
@@ -34,6 +35,7 @@ describe("useModelState", () => {
     expect(result.current.defaultOpusModelName).toBe("Kimi K2");
     expect(result.current.defaultHaikuModel).toBe("legacy-small");
     expect(result.current.defaultHaikuModelName).toBe("legacy-small");
+    expect(result.current.subagentModel).toBe("subagent-model[1M]");
   });
 
   it("writes and clears role display-name env fields without changing model mapping", () => {
@@ -94,6 +96,42 @@ describe("useModelState", () => {
     expect(result.current.defaultSonnetModelName).toBe("deepseek-v4-pro");
   });
 
+  it("writes and clears the Claude Code subagent model env field", () => {
+    let latestConfig = JSON.stringify({
+      env: {
+        ANTHROPIC_MODEL: "fallback-model",
+      },
+    });
+    const onConfigChange = vi.fn((config: string) => {
+      latestConfig = config;
+    });
+
+    const { result } = renderHook(() =>
+      useModelState({
+        settingsConfig: latestConfig,
+        onConfigChange,
+      }),
+    );
+
+    act(() => {
+      result.current.handleModelChange(
+        "CLAUDE_CODE_SUBAGENT_MODEL",
+        "subagent-model[1M]",
+      );
+    });
+
+    let env = JSON.parse(latestConfig).env;
+    expect(env.ANTHROPIC_MODEL).toBe("fallback-model");
+    expect(env.CLAUDE_CODE_SUBAGENT_MODEL).toBe("subagent-model[1M]");
+
+    act(() => {
+      result.current.handleModelChange("CLAUDE_CODE_SUBAGENT_MODEL", "");
+    });
+
+    env = JSON.parse(latestConfig).env;
+    expect(env.CLAUDE_CODE_SUBAGENT_MODEL).toBeUndefined();
+  });
+
   it("normalizes Claude Code 1M markers for UI toggles", () => {
     expect(hasClaudeOneMMarker("deepseek-v4-pro[1m]")).toBe(true);
     expect(hasClaudeOneMMarker("deepseek-v4-pro [1M]  ")).toBe(true);