fix: resolve Docker FFmpeg SIGSEGV crash and build failures (#24)

The ffmpeg-static npm package bundles a pre-compiled binary that passes
`ffmpeg -version` but crashes with SIGSEGV during actual audio processing
inside Docker containers (incompatible glibc/missing shared libraries).

Changes:
- Install system FFmpeg via apt-get in Docker production stage, which is
  always compatible with the container runtime
- Reverse FFmpeg resolution priority in player.ts: prefer system FFmpeg,
  fall back to ffmpeg-static (for non-Docker environments like Windows)
- Optimize Dockerfile multi-stage build: compile native modules (opus,
  better-sqlite3) in builder stage and copy to production, eliminating
  the need for build tools (python3, make, g++) in the production image
- Fix qq-music-api dependency from file:../qq-music-api (path outside
  Docker build context, breaks npm ci) to npm registry ^2.2.10

https://claude.ai/code/session_01JAV8sBokoifKh4Hc8XbJws

scripts/docker/docker-compose.yml

@@ -1,8 +1,8 @@
 # TSMusicBot — Docker Compose
 # 一键部署：docker-compose up -d
 #
-# 所有依赖已内置（Node.js, FFmpeg, Opus 编码器）
-# 无需安装任何额外软件
+# 所有依赖已内置（Node.js, FFmpeg, Opus 编码器）无需安装任何额外软件
+# FFmpeg 使用系统包管理器安装，确保容器内兼容性
 
 services:
   tsmusicbot: