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/useModelState.ts

@@ -0,0 +1,55 @@
+import { useState, useCallback } from "react";
+
+interface UseModelStateProps {
+  settingsConfig: string;
+  onConfigChange: (config: string) => void;
+}
+
+/**
+ * 管理模型选择状态
+ * 支持 ANTHROPIC_MODEL 和 ANTHROPIC_SMALL_FAST_MODEL
+ */
+export function useModelState({
+  settingsConfig,
+  onConfigChange,
+}: UseModelStateProps) {
+  const [claudeModel, setClaudeModel] = useState("");
+  const [claudeSmallFastModel, setClaudeSmallFastModel] = useState("");
+
+  const handleModelChange = useCallback(
+    (field: "ANTHROPIC_MODEL" | "ANTHROPIC_SMALL_FAST_MODEL", value: string) => {
+      if (field === "ANTHROPIC_MODEL") {
+        setClaudeModel(value);
+      } else {
+        setClaudeSmallFastModel(value);
+      }
+
+      try {
+        const currentConfig = settingsConfig
+          ? JSON.parse(settingsConfig)
+          : { env: {} };
+        if (!currentConfig.env) currentConfig.env = {};
+
+        if (value.trim()) {
+          currentConfig.env[field] = value.trim();
+        } else {
+          delete currentConfig.env[field];
+        }
+
+        onConfigChange(JSON.stringify(currentConfig, null, 2));
+      } catch (err) {
+        // 如果 JSON 解析失败，不做处理
+        console.error("Failed to update model config:", err);
+      }
+    },
+    [settingsConfig, onConfigChange],
+  );
+
+  return {
+    claudeModel,
+    setClaudeModel,
+    claudeSmallFastModel,
+    setClaudeSmallFastModel,
+    handleModelChange,
+  };
+}