refactor: create modular hooks and integrate API key input

- Create custom hooks for state management:
  - useProviderCategory: manages provider category state
  - useApiKeyState: manages API key input with auto-sync to config
  - useBaseUrlState: manages base URL for Claude and Codex
  - useModelState: manages model selection state

- Integrate API key input into simplified ProviderForm:
  - Add ApiKeyInput component for Claude mode
  - Auto-populate API key into settings config
  - Disable for official providers

- Fix EndpointSpeedTest type errors:
  - Fix import paths to use @ alias
  - Add temporary type definitions
  - Format all TODO comments properly
  - Remove incorrect type assertions
  - Comment out unimplemented window.api checks

All TypeScript type checks now pass.

src/components/providers/forms/hooks/useApiKeyState.ts

@@ -0,0 +1,63 @@
+import { useState, useCallback } from "react";
+import {
+  getApiKeyFromConfig,
+  setApiKeyInConfig,
+  hasApiKeyField,
+} from "@/utils/providerConfigUtils";
+
+interface UseApiKeyStateProps {
+  initialConfig?: string;
+  onConfigChange: (config: string) => void;
+  selectedPresetId: string | null;
+}
+
+/**
+ * 管理 API Key 输入状态
+ * 自动同步 API Key 和 JSON 配置
+ */
+export function useApiKeyState({
+  initialConfig,
+  onConfigChange,
+  selectedPresetId,
+}: UseApiKeyStateProps) {
+  const [apiKey, setApiKey] = useState(() => {
+    if (initialConfig) {
+      return getApiKeyFromConfig(initialConfig);
+    }
+    return "";
+  });
+
+  const handleApiKeyChange = useCallback(
+    (key: string) => {
+      setApiKey(key);
+
+      const configString = setApiKeyInConfig(
+        initialConfig || "{}",
+        key.trim(),
+        {
+          createIfMissing:
+            selectedPresetId !== null && selectedPresetId !== "custom",
+        },
+      );
+
+      onConfigChange(configString);
+    },
+    [initialConfig, selectedPresetId, onConfigChange],
+  );
+
+  const showApiKey = useCallback(
+    (config: string, isEditMode: boolean) => {
+      return (
+        selectedPresetId !== null || (!isEditMode && hasApiKeyField(config))
+      );
+    },
+    [selectedPresetId],
+  );
+
+  return {
+    apiKey,
+    setApiKey,
+    handleApiKeyChange,
+    showApiKey,
+  };
+}