feat(scripts): add diagnostic, seed, and test scripts

- Add add-ai-provider-visibility and add-missing-columns migration scripts

- Add clear-error-book, seed-error-book, diagnose-error-book scripts

- Add diagnose-tables and create-missing-tables scripts

- Add test-failing-modules and test-teacher-pages test scripts

scripts/diagnose-tables.js

@@ -0,0 +1,65 @@
+/**
+ * 诊断 4 个失败模块的数据库表结构和查询问题
+ */
+require("dotenv/config");
+const mysql = require("mysql2/promise");
+
+async function main() {
+  const conn = await mysql.createConnection({ uri: process.env.DATABASE_URL });
+
+  const tables = [
+    "learning_diagnostic_reports",
+    "announcements",
+    "messages",
+    "message_notifications",
+    "error_book_items",
+    "error_book_reviews",
+  ];
+
+  for (const table of tables) {
+    console.log(`\n${"=".repeat(60)}`);
+    console.log(`表: ${table}`);
+    console.log("=".repeat(60));
+
+    // 检查表是否存在
+    const [exists] = await conn.execute(
+      `SELECT TABLE_NAME FROM information_schema.TABLES WHERE TABLE_SCHEMA = DATABASE() AND TABLE_NAME = ?`,
+      [table],
+    );
+
+    if (exists.length === 0) {
+      console.log("  ❌ 表不存在!");
+      continue;
+    }
+
+    console.log("  ✅ 表存在");
+
+    // 获取列信息
+    const [cols] = await conn.execute(
+      `SELECT COLUMN_NAME, DATA_TYPE, IS_NULLABLE, COLUMN_DEFAULT, COLUMN_TYPE
+       FROM information_schema.COLUMNS
+       WHERE TABLE_SCHEMA = DATABASE() AND TABLE_NAME = ?
+       ORDER BY ORDINAL_POSITION`,
+      [table],
+    );
+    console.log("  列:");
+    for (const c of cols) {
+      console.log(`    - ${c.COLUMN_NAME}: ${c.COLUMN_TYPE} (NULL=${c.IS_NULLABLE}, DEFAULT=${c.COLUMN_DEFAULT})`);
+    }
+
+    // 获取行数
+    try {
+      const [count] = await conn.execute(`SELECT COUNT(*) as cnt FROM \`${table}\``);
+      console.log(`  行数: ${count[0].cnt}`);
+    } catch (err) {
+      console.log(`  行数查询失败: ${err.message}`);
+    }
+  }
+
+  await conn.end();
+}
+
+main().catch((err) => {
+  console.error("致命错误:", err);
+  process.exit(1);
+});