新增 fonts 目錄：字體隨專案打包，LibreOffice 轉換時自動載入

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/contractService.js

@@ -7,6 +7,7 @@ const { pathToFileURL } = require('node:url');
 const JSZip = require('jszip');
 
 const TEMPLATE_DIR = path.resolve(process.env.TEMPLATE_DIR || path.join(process.cwd(), 'templates'));
+const FONTS_DIR = path.resolve(process.env.FONTS_DIR || path.join(process.cwd(), 'fonts'));
 const TEMP_DIR = path.resolve(process.env.TEMP_DIR || path.join(os.tmpdir(), 'rental-contracts'));
 const SOFFICE_BIN = process.env.SOFFICE_BIN || (
   process.platform === 'win32'
@@ -205,9 +206,26 @@ function assertAllPlaceholdersWereFound(replacementCounts) {
   }
 }
 
+async function copyFontsToProfile(profileDir) {
+  let fontFiles;
+  try {
+    fontFiles = await fs.readdir(FONTS_DIR);
+  } catch {
+    return;
+  }
+  const profileFontsDir = path.join(profileDir, 'user', 'fonts');
+  await fs.mkdir(profileFontsDir, { recursive: true });
+  await Promise.all(
+    fontFiles
+      .filter((f) => /\.(ttf|otf|ttc)$/i.test(f))
+      .map((f) => fs.copyFile(path.join(FONTS_DIR, f), path.join(profileFontsDir, f))),
+  );
+}
+
 async function convertToPdf(inputPath, outputDir) {
   const libreOfficeProfileDir = path.join(outputDir, 'lo-profile');
   await fs.mkdir(libreOfficeProfileDir, { recursive: true });
+  await copyFontsToProfile(libreOfficeProfileDir);
 
   const args = [
     `-env:UserInstallation=${pathToFileURL(libreOfficeProfileDir).href}`,