feat: Verdaccio 缓存可视化管理面板（前端 + 后端 + Docker）

- 前端 Vue3+Vite+Element Plus 按需引入，双主题（bright/dark）CSS 变量
- 三端响应式（桌面/平板/手机），登录/概览/检索/阈值/忽略/动态 6 页面
- 后端 Express + better-sqlite3，目录扫描 + demo 模式，清理原子写入
- Dockerfile 多阶段构建 + docker-compose（storage 只读挂载）

backend/db.js

@@ -0,0 +1,86 @@
+/**
+ * SQLite 数据层（§4.1）
+ * 表：settings / ignored_packages / logs
+ */
+import Database from 'better-sqlite3'
+import fs from 'node:fs'
+import path from 'node:path'
+import { fileURLToPath } from 'node:url'
+
+const __dirname = path.dirname(fileURLToPath(import.meta.url))
+// 数据目录：环境变量 DATA_DIR 可覆盖（Docker 挂载 manager-data）
+const DATA_DIR = process.env.DATA_DIR || path.join(__dirname, 'data')
+fs.mkdirSync(DATA_DIR, { recursive: true })
+
+const db = new Database(path.join(DATA_DIR, 'manager.db'))
+db.pragma('journal_mode = WAL')
+
+db.exec(`
+CREATE TABLE IF NOT EXISTS settings (
+  key   TEXT PRIMARY KEY,
+  value TEXT
+);
+CREATE TABLE IF NOT EXISTS ignored_packages (
+  pkg_name   TEXT PRIMARY KEY,
+  ignored_at DATETIME DEFAULT CURRENT_TIMESTAMP
+);
+CREATE TABLE IF NOT EXISTS logs (
+  id               INTEGER PRIMARY KEY AUTOINCREMENT,
+  pkg_name         TEXT,
+  deleted_versions TEXT,
+  deleted_count    INTEGER,
+  freed_space      TEXT,
+  created_at       DATETIME DEFAULT CURRENT_TIMESTAMP
+);
+`)
+
+// —— settings ——
+export function getSetting(key, def = null) {
+  const row = db.prepare('SELECT value FROM settings WHERE key = ?').get(key)
+  return row ? row.value : def
+}
+
+export function setSetting(key, value) {
+  db.prepare(
+    'INSERT INTO settings (key, value) VALUES (?, ?) ON CONFLICT(key) DO UPDATE SET value = excluded.value',
+  ).run(key, String(value))
+}
+
+// —— ignored ——
+export function getIgnored() {
+  return db.prepare('SELECT pkg_name FROM ignored_packages ORDER BY ignored_at DESC').all().map(r => r.pkg_name)
+}
+
+export function getIgnoredRows() {
+  return db.prepare('SELECT pkg_name, ignored_at FROM ignored_packages ORDER BY ignored_at DESC').all()
+}
+
+export function isIgnored(pkgName) {
+  return !!db.prepare('SELECT 1 FROM ignored_packages WHERE pkg_name = ?').get(pkgName)
+}
+
+export function addIgnored(pkgName) {
+  db.prepare(
+    'INSERT INTO ignored_packages (pkg_name) VALUES (?) ON CONFLICT(pkg_name) DO NOTHING',
+  ).run(pkgName)
+}
+
+export function removeIgnored(pkgName) {
+  db.prepare('DELETE FROM ignored_packages WHERE pkg_name = ?').run(pkgName)
+}
+
+// —— logs ——
+export function addLog({ pkgName, deletedVersions, deletedCount, freedSpace }) {
+  const info = db.prepare(
+    'INSERT INTO logs (pkg_name, deleted_versions, deleted_count, freed_space) VALUES (?, ?, ?, ?)',
+  ).run(pkgName, deletedVersions, deletedCount, freedSpace)
+  return info.lastInsertRowid
+}
+
+export function getLogs(limit = 50) {
+  return db.prepare(
+    'SELECT * FROM logs ORDER BY id DESC LIMIT ?',
+  ).all(limit)
+}
+
+export default db