fix: add requirements

requirements.txt

@@ -0,0 +1,13 @@
+# ── Web framework ─────────────────────────────────────────────────────────────
+flask>=2.3.0
+
+# ── AI / Audio ────────────────────────────────────────────────────────────────
+# audiocraft pulls in torch, torchaudio, transformers, einops, etc. as deps.
+# In the Dockerfile, torch is installed first with the CPU wheel index URL
+# so that line here is intentionally omitted (Docker handles it).
+audiocraft
+
+# ── Local dev only ────────────────────────────────────────────────────────────
+# Uncomment when running locally without Docker:
+# torch
+# torchaudio