refactor: 升级依赖版本并优化构建系统

- 升级核心依赖 (axum 0.8, tower-http 0.6, alsa 0.11 等)
- 简化交叉编译配置，切换至 Debian 11 提高兼容性
- 新增 Debian 包打包支持 (debuerreotype 模板)
- 移除独立的 mjpeg 解码器，简化视频模块
- 静态链接 libx264/libx265/libopus 到二进制

build/debian/postinst.tpl

@@ -0,0 +1,39 @@
+#!/bin/bash
+# Post-installation script for one-kvm
+
+set -e
+
+case "$1" in
+    configure|abort-upgrade|abort-remove|abort-deconfigure)
+        # Create data directory
+        mkdir -p /var/lib/one-kvm/ventoy
+        mkdir -p /var/log/one-kvm
+
+        # Set permissions
+        chmod 755 /var/lib/one-kvm
+        chmod 755 /var/lib/one-kvm/ventoy
+        chmod 755 /var/log/one-kvm
+
+        # Enable and start service (if systemd is available)
+        if [ -d /run/systemd/system ]; then
+            systemctl daemon-reload
+            systemctl enable one-kvm
+            # Don't start here, let user configure first
+        fi
+        ;;
+    triggered)
+        # Handle triggers (e.g., systemd restart)
+        if [ -d /run/systemd/system ]; then
+            systemctl restart one-kvm || true
+        fi
+        ;;
+    abort-rollback|failed-upgrade)
+        exit 0
+        ;;
+    *)
+        echo "postinst called with unknown argument: $1" >&2
+        exit 1
+        ;;
+esac
+
+exit 0