feat: metona-sqlark v0.1.12 — 前端TypeScript关系型数据库

- 4种存储引擎：Memory / IndexedDB / OPFS / Hybrid
- 完整SQL支持：SELECT/INSERT/UPDATE/DELETE/JOIN/GROUP BY/HAVING/DISTINCT
- Query Builder链式API + TypeScript泛型支持
- 聚合函数：COUNT/SUM/AVG/MIN/MAX
- 事务、插件系统(14 hooks)、发布订阅、数据迁移、导入导出
- React/Vue框架集成
- 264个测试用例，93.46%覆盖率
- 零运行时依赖

src/plugin/index.ts

@@ -0,0 +1,91 @@
+/**
+ * metona-sqlark Plugin — 插件系统
+ * @module plugin
+ *
+ * 管理插件的注册、生命周期和钩子调度。
+ */
+
+import type { MetonaPlugin, HookName } from '../constants';
+
+// ---------------------------------------------------------------------------
+//  Hook 回调类型
+// ---------------------------------------------------------------------------
+
+export type HookCallback = (...args: unknown[]) => void | Promise<void>;
+
+// ---------------------------------------------------------------------------
+//  PluginManager
+// ---------------------------------------------------------------------------
+
+export class PluginManager {
+  private plugins: MetonaPlugin[] = [];
+  private hooks: Map<HookName, HookCallback[]> = new Map();
+
+  /** 注册插件 */
+  register(plugin: MetonaPlugin): void {
+    // 按优先级插入
+    const priority = plugin.priority ?? 0;
+    const insertIndex = this.plugins.findIndex(
+      (p) => (p.priority ?? 0) < priority,
+    );
+    if (insertIndex === -1) {
+      this.plugins.push(plugin);
+    } else {
+      this.plugins.splice(insertIndex, 0, plugin);
+    }
+    // 安装
+    plugin.install(null); // 实际引用由 MetonaSqlark 注入
+  }
+
+  /** 卸载插件 */
+  unregister(pluginName: string): void {
+    const idx = this.plugins.findIndex((p) => p.name === pluginName);
+    if (idx !== -1) {
+      this.plugins[idx].destroy();
+      this.plugins.splice(idx, 1);
+    }
+  }
+
+  /** 获取所有已注册插件 */
+  getPlugins(): MetonaPlugin[] {
+    return [...this.plugins];
+  }
+
+  /** 添加钩子回调 */
+  on(hook: HookName, callback: HookCallback): void {
+    const callbacks = this.hooks.get(hook) ?? [];
+    callbacks.push(callback);
+    this.hooks.set(hook, callbacks);
+  }
+
+  /** 移除钩子回调 */
+  off(hook: HookName, callback: HookCallback): void {
+    const callbacks = this.hooks.get(hook);
+    if (callbacks) {
+      const idx = callbacks.indexOf(callback);
+      if (idx !== -1) callbacks.splice(idx, 1);
+    }
+  }
+
+  /** 触发钩子 */
+  async trigger(hook: HookName, ...args: unknown[]): Promise<void> {
+    const callbacks = this.hooks.get(hook);
+    if (callbacks) {
+      for (const cb of callbacks) {
+        await cb(...args);
+      }
+    }
+  }
+
+  /** 销毁所有插件 */
+  destroy(): void {
+    for (const plugin of this.plugins) {
+      try { plugin.destroy(); } catch (e) {
+        // eslint-disable-next-line no-console
+        console.warn(`[metona-sqlark] Plugin "${plugin.name}" destroy error:`, e);
+      }
+    }
+    this.plugins = [];
+    this.hooks.clear();
+  }
+}