fix(docker): Revert to libasound2 for Debian bookworm

- libasound2t64 is for Debian trixie (13), not bookworm (12)
- Keep build tools fix for native modules

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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

backend/Dockerfile

@@ -42,7 +42,7 @@ RUN apt-get update && apt-get install -y \
     fonts-liberation \
     libnss3 \
     libxss1 \
-    libasound2t64 \
+    libasound2 \
     libatk-bridge2.0-0 \
     libgtk-3-0 \
     --no-install-recommends \