feat: 添加译文功能 + Attention Is All You Need 中文译本

api/server.py

@@ -464,6 +464,24 @@ def download_single_pdf(arxiv_id: str):
     except subprocess.TimeoutExpired:
         return {"ok": False, "arxiv_id": arxiv_id, "status": "timeout"}
 
+# ─── Routes: Translated PDFs ────────────────────────────
+TRANSLATED_DIR = PAPERS_DIR / "translated"
+
+@app.get("/api/translated/{arxiv_id}")
+def check_translation(arxiv_id: str):
+    """Check if translation exists for a paper"""
+    fn = f"{arxiv_id}.pdf"
+    return {"arxiv_id": arxiv_id, "exists": (TRANSLATED_DIR / fn).exists()}
+
+@app.get("/papers/translated/{arxiv_id}.pdf")
+def serve_translated(arxiv_id: str):
+    """Serve translated PDF from cache"""
+    fp = TRANSLATED_DIR / f"{arxiv_id}.pdf"
+    if not fp.exists():
+        raise HTTPException(status_code=404, detail="Translation not found")
+    return FileResponse(fp, media_type="application/pdf",
+        headers={"Content-Disposition": "inline"})
+
 # ─── Health ─────────────────────────────────────────────
 @app.get("/api/health")
 def health():