feat: merge PVE VM management + local features

- Merge PVE (Proxmox VE) virtual machine management from remote
  - PVE host CRUD API
  - VM status query / start / stop operations
  - PVE database tables and models
  - Frontend VM status display and control buttons
  - SPA routing fix for nested asset paths

- Keep local features:
  - Change password functionality
  - Log cleanup service
  - Docker containerization (Dockerfile + docker-compose)
  - Empty machine ping log spam fix
  - settings table for admin password storage

- Update machines handlers to support PVE fields
- Update frontend API client with PVE endpoints

Dockerfile

@@ -0,0 +1,83 @@
+# 构建阶段 1：构建前端
+FROM node:20-alpine AS web-builder
+
+WORKDIR /app/web
+
+# 复制前端依赖文件
+COPY web/package*.json ./
+RUN npm ci
+
+# 复制前端源码并构建
+COPY web/ ./
+RUN npm run build
+
+# 构建阶段 2：构建 Go 后端
+FROM golang:1.26-alpine AS server-builder
+
+WORKDIR /app/server
+
+# 安装构建依赖
+RUN apk add --no-cache git gcc musl-dev
+
+# 复制 Go 模块文件
+COPY go.mod go.sum ./
+RUN go mod download
+
+# 复制后端源码
+COPY server/ ./
+
+# 复制前端构建产物到 static 目录
+COPY --from=web-builder /app/web/dist ./static/
+
+# 构建 Go 二进制（静态链接，无 CGO）
+RUN CGO_ENABLED=0 GOOS=linux go build -ldflags="-s -w" -o /app/lan-manager .
+
+# 运行阶段：最小化镜像
+FROM alpine:3.21
+
+LABEL maintainer="LAN Manager"
+LABEL description="局域网机器管理后台"
+
+WORKDIR /app
+
+# 安装必要的运行时依赖
+# iputils 提供 ping 命令（用于网络检测）
+# ca-certificates 用于 HTTPS 请求
+RUN apk add --no-cache \
+    ca-certificates \
+    iputils \
+    libcap \
+    && rm -rf /var/cache/apk/*
+
+# 从构建阶段复制二进制文件
+COPY --from=server-builder /app/lan-manager /app/lan-manager
+
+# 赋予 ping 权限（不需要 root 也能执行 ICMP ping）
+RUN setcap cap_net_raw+ep /bin/ping || true
+
+# 创建非 root 用户运行服务
+RUN adduser -D -s /bin/sh lanmgr && \
+    mkdir -p /app/data && \
+    chown -R lanmgr:lanmgr /app
+
+# 切换到非 root 用户
+USER lanmgr
+
+# 暴露端口
+EXPOSE 8080
+
+# 健康检查
+HEALTHCHECK --interval=30s --timeout=5s --start-period=5s --retries=3 \
+    CMD wget --no-verbose --tries=1 --spider http://localhost:8080/api/health || exit 1
+
+# 设置数据目录环境变量
+ENV DATA_DIR=/app/data
+ENV DB_PATH=/app/data/lan-manager.db
+ENV HOST=0.0.0.0
+ENV PORT=8080
+
+# 数据卷（持久化 SQLite 数据库）
+VOLUME ["/app/data"]
+
+# 启动命令
+ENTRYPOINT ["/app/lan-manager"]