feat: 实现后端基础架构与 VOD 核心 API（Express + SQLite + JWT）

apps/server/src/db.ts

@@ -0,0 +1,66 @@
+import fs from 'fs';
+import path from 'path';
+import sqlite3 from 'sqlite3';
+import { open, Database } from 'sqlite';
+import { config } from './config';
+
+let db: Database<sqlite3.Database, sqlite3.Statement> | null = null;
+
+export async function getDb(): Promise<Database<sqlite3.Database, sqlite3.Statement>> {
+  if (db) return db;
+
+  const dbDir = path.dirname(config.dbPath);
+  if (!fs.existsSync(dbDir)) {
+    fs.mkdirSync(dbDir, { recursive: true });
+  }
+
+  db = await open({
+    filename: config.dbPath,
+    driver: sqlite3.Database,
+  });
+
+  await initSchema();
+  return db;
+}
+
+async function initSchema(): Promise<void> {
+  const database = await getDb();
+
+  await database.exec(`
+    CREATE TABLE IF NOT EXISTS users (
+      id TEXT PRIMARY KEY,
+      username TEXT UNIQUE NOT NULL,
+      password_hash TEXT NOT NULL,
+      role TEXT NOT NULL DEFAULT 'admin',
+      created_at TEXT NOT NULL
+    );
+
+    CREATE TABLE IF NOT EXISTS accounts (
+      id TEXT PRIMARY KEY,
+      name TEXT NOT NULL,
+      access_key_id TEXT NOT NULL,
+      access_key_secret TEXT NOT NULL,
+      region TEXT NOT NULL,
+      endpoint TEXT,
+      is_active INTEGER NOT NULL DEFAULT 0,
+      created_at TEXT NOT NULL,
+      updated_at TEXT NOT NULL
+    );
+
+    CREATE INDEX IF NOT EXISTS idx_accounts_active ON accounts(is_active);
+
+    CREATE TABLE IF NOT EXISTS operation_logs (
+      id TEXT PRIMARY KEY,
+      user_id TEXT,
+      username TEXT,
+      action TEXT NOT NULL,
+      target_type TEXT NOT NULL,
+      target_ids TEXT,
+      details TEXT,
+      created_at TEXT NOT NULL
+    );
+
+    CREATE INDEX IF NOT EXISTS idx_logs_created ON operation_logs(created_at);
+    CREATE INDEX IF NOT EXISTS idx_logs_action ON operation_logs(action);
+  `);
+}