feat: JsonEditor for inputting JSON content (#4)

* feat(editor): add JsonEditor component for JSON configuration editing

* fix(provider): update API Key visibility logic in ProviderForm component

* fix(editor): stabilize JsonEditor height and restore API Key logic

- Revert API Key visibility to preset-based rule and injection to non-custom preset only.
- Reduce JsonEditor min-height from rows*22px to rows*18px to lessen layout jitter when switching presets.
- Keep fonts/size consistent with the previous textarea for visual parity.

* - fix(form): remove websiteUrl auto-extraction from JSON to prevent incorrect overrides

---------

Co-authored-by: Jason <farion1231@gmail.com>

src/components/JsonEditor.tsx

@@ -0,0 +1,97 @@
+import React, { useRef, useEffect } from "react";
+import { EditorView, basicSetup } from "codemirror";
+import { json } from "@codemirror/lang-json";
+import { oneDark } from "@codemirror/theme-one-dark";
+import { EditorState } from "@codemirror/state";
+import { placeholder } from "@codemirror/view";
+
+interface JsonEditorProps {
+  value: string;
+  onChange: (value: string) => void;
+  placeholder?: string;
+  darkMode?: boolean;
+  rows?: number;
+}
+
+const JsonEditor: React.FC<JsonEditorProps> = ({
+  value,
+  onChange,
+  placeholder: placeholderText = "",
+  darkMode = false,
+  rows = 12,
+}) => {
+  const editorRef = useRef<HTMLDivElement>(null);
+  const viewRef = useRef<EditorView | null>(null);
+
+  useEffect(() => {
+    if (!editorRef.current) return;
+
+    // 创建编辑器扩展
+    const minHeightPx = Math.max(1, rows) * 18; // 降低最小高度以减少抖动
+    const sizingTheme = EditorView.theme({
+      "&": { minHeight: `${minHeightPx}px` },
+      ".cm-scroller": { overflow: "auto" },
+      ".cm-content": {
+        fontFamily:
+          "ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, 'Liberation Mono', 'Courier New', monospace",
+        fontSize: "14px",
+      },
+    });
+
+    const extensions = [
+      basicSetup,
+      json(),
+      placeholder(placeholderText || ""),
+      sizingTheme,
+      EditorView.updateListener.of((update) => {
+        if (update.docChanged) {
+          const newValue = update.state.doc.toString();
+          onChange(newValue);
+        }
+      }),
+    ];
+
+    // 如果启用深色模式，添加深色主题
+    if (darkMode) {
+      extensions.push(oneDark);
+    }
+
+    // 创建初始状态
+    const state = EditorState.create({
+      doc: value,
+      extensions,
+    });
+
+    // 创建编辑器视图
+    const view = new EditorView({
+      state,
+      parent: editorRef.current,
+    });
+
+    viewRef.current = view;
+
+    // 清理函数
+    return () => {
+      view.destroy();
+      viewRef.current = null;
+    };
+  }, [darkMode, rows]); // 依赖项中不包含 onChange 和 placeholder，避免不必要的重建
+
+  // 当 value 从外部改变时更新编辑器内容
+  useEffect(() => {
+    if (viewRef.current && viewRef.current.state.doc.toString() !== value) {
+      const transaction = viewRef.current.state.update({
+        changes: {
+          from: 0,
+          to: viewRef.current.state.doc.length,
+          insert: value,
+        },
+      });
+      viewRef.current.dispatch(transaction);
+    }
+  }, [value]);
+
+  return <div ref={editorRef} style={{ width: "100%" }} />;
+};
+
+export default JsonEditor;