feat: add recipe translation tool with AI translation and settings management

- Add Word document parsing and translation export
- Add database configuration management
- Add AI/LLM translation configuration
- Add translation vocabulary management
- Add export settings (colors, page orientation, headers)
- Separate database and AI configurations
- Add debounced search to prevent database overload

app/api/config/route.ts

@@ -0,0 +1,57 @@
+import { NextResponse } from "next/server";
+import { getConfig, saveDBConfig, saveAIConfig, type DBConfig, type AIConfig } from "@/lib/config";
+
+// GET /api/config - 获取完整配置
+export async function GET() {
+  try {
+    const config = getConfig();
+    return NextResponse.json({
+      success: true,
+      data: config,
+    });
+  } catch (error) {
+    return NextResponse.json(
+      { success: false, error: "读取配置失败" },
+      { status: 500 }
+    );
+  }
+}
+
+// POST /api/config - 保存配置
+// Body 格式: { db?: DBConfig, ai?: AIConfig }
+export async function POST(request: Request) {
+  try {
+    const body = await request.json();
+    const { db, ai } = body;
+
+    if (db) {
+      saveDBConfig(db);
+    }
+
+    if (ai) {
+      saveAIConfig(ai);
+    }
+
+    // 如果同时发送了完整配置
+    if (!db && !ai && body.db === undefined && body.ai === undefined) {
+      // 可能是旧的扁平格式，尝试兼容
+      if (body.apiKey !== undefined || body.baseUrl !== undefined || body.model !== undefined) {
+        saveAIConfig({
+          apiKey: body.apiKey,
+          baseUrl: body.baseUrl,
+          model: body.model,
+        });
+      }
+    }
+
+    return NextResponse.json({
+      success: true,
+      message: "配置已保存",
+    });
+  } catch (error) {
+    return NextResponse.json(
+      { success: false, error: "保存失败" },
+      { status: 500 }
+    );
+  }
+}