feat(proxy): 添加本地代理请求覆盖功能，支持自定义请求头和请求体 (#4589)

* feat(proxy): 添加本地代理请求覆盖功能，支持自定义请求头和请求体

* fix(proxy): harden local request overrides validation

* feat(proxy): 添加受保护的本地代理请求头名称验证功能

* fix(i18n): 更新本地代理请求覆盖的错误提示信息格式

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Co-authored-by: jason.mei <jason.mei@ucloud.cn>

tests/components/ClaudeFormFields.test.tsx

@@ -95,6 +95,10 @@ const renderCopilotForm = (overrides: Partial<ClaudeFormFieldsProps> = {}) => {
     onFullUrlChange: vi.fn(),
     customUserAgent: "",
     onCustomUserAgentChange: vi.fn(),
+    localProxyHeadersOverride: "",
+    onLocalProxyHeadersOverrideChange: vi.fn(),
+    localProxyBodyOverride: "",
+    onLocalProxyBodyOverrideChange: vi.fn(),
     ...overrides,
   };