feat: add cover selection workflow and docker profiles

server/.dockerignore

@@ -0,0 +1,8 @@
+.git
+node_modules
+.env
+.env.*
+*.log
+tmp
+coverage
+.DS_Store

server/index.js

@@ -23,7 +23,7 @@ const sanitizeHtml = (text = '') =>
     .replace(/\n/g, '<br/>');
 
 app.post('/generate-epub', async (req, res) => {
-  const { text, meta } = req.body || {};
+  const { text, meta, cover } = req.body || {};
   if (!text || !text.trim()) {
     return res.status(400).json({ message: 'text is required' });
   }
@@ -40,12 +40,29 @@ app.post('/generate-epub', async (req, res) => {
   ];
 
   const outputPath = join(tmpdir(), `imgpub-${uuidV4()}.epub`);
+  let coverPath;
 
   try {
-    const epub = new Epub({ title, author, content }, outputPath);
+    if (cover?.data) {
+      const coverBuffer = Buffer.from(cover.data, 'base64');
+      const coverExtension =
+        cover?.mimeType?.split('/').pop() || cover?.filename?.split('.').pop() || 'png';
+      coverPath = join(tmpdir(), `imgpub-cover-${uuidV4()}.${coverExtension}`);
+      await fs.writeFile(coverPath, coverBuffer);
+    }
+
+    const epubOptions = { title, author, content };
+    if (coverPath) {
+      epubOptions.cover = coverPath;
+    }
+
+    const epub = new Epub(epubOptions, outputPath);
     await epub.promise;
     const buffer = await fs.readFile(outputPath);
     await fs.unlink(outputPath).catch(() => {});
+    if (coverPath) {
+      await fs.unlink(coverPath).catch(() => {});
+    }
     res.json({ filename, data: buffer.toString('base64') });
   } catch (error) {
     console.error('EPUB generation failed:', error);