新增 family_invite 家庭邀请码表(schema+0009迁移)

Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>

src/db/schema.ts

@@ -78,6 +78,21 @@ export const activationCodes = mysqlTable("activation_code", {
   usedAt: datetime("used_at"),
 });
 
+// ===== 家庭邀请码(家长生成,其他家长凭码注册加入;一次性,15 分钟)=====
+export const familyInvites = mysqlTable("family_invite", {
+  id: bigint("id", { mode: "number" }).primaryKey().autoincrement(),
+  familyId: bigint("family_id", { mode: "number" })
+    .notNull()
+    .references(() => families.id, { onDelete: "cascade" }),
+  codeHash: varchar("code_hash", { length: 64 }).notNull(),
+  createdBy: bigint("created_by", { mode: "number" })
+    .notNull()
+    .references(() => users.id),
+  createdAt: datetime("created_at").notNull().default(sql`CURRENT_TIMESTAMP`),
+  expiresAt: datetime("expires_at").notNull(),
+  usedAt: datetime("used_at"),
+});
+
 // ===== 周模板(每个孩子 × 每周几 × 每条任务)=====
 export const taskTemplates = mysqlTable(
   "task_template",