feat(announcements,messaging,notifications): 实现所有长期问题 — SSE 实时推送 + 通知日志持久化 + 优先级/归档 + 消息星标/草稿 + 公告已读回执/置顶 + 分类筛选/桌面推送 + 测试覆盖

P1-8 通知实时推送（SSE）:
- 新增 /api/notifications/stream SSE 端点（15 秒推送，5 分钟超时）
- 新增 useNotificationStream Hook（SSE + 轮询降级）
- NotificationDropdown 改用 SSE 实时推送

P2-12 测试覆盖:
- notifications/dispatcher.test.ts（6 个测试，渠道选择逻辑）
- notifications/channels/in-app-channel.test.ts（9 个测试，类型映射）
- messaging/schema.test.ts（34 个测试，Zod 校验）
- tests/e2e/messages.spec.ts（消息模块 E2E 测试）
- vitest.unit.config.ts 添加 server-only stub

P2-13a 通知发送日志持久化:
- 新增 notification_logs 表（userId/title/channel/status/messageId/error/sentAt）
- logNotificationSend 改为 async 写入 DB（失败降级 console）
- dispatcher 传递 payload 用于持久化

P2-13b 通知优先级和归档:
- messageNotifications 表新增 priority（low/normal/high/urgent）和 isArchived 字段
- getNotifications 支持归档和优先级筛选
- 新增 archiveNotificationAction
- NotificationList 显示优先级 Badge 和归档按钮

P2-13c 消息星标和草稿:
- messages 表新增 isStarred 字段
- 新增 message_drafts 表
- 新增 toggleMessageStar + 草稿 CRUD Server Actions
- 新增 5 个草稿 data-access 函数

P2-13d 公告已读回执和置顶:
- announcements 表新增 isPinned 字段
- 新增 announcement_reads 表（唯一索引保证幂等）
- 新增 toggleAnnouncementPinAction + markAnnouncementAsReadAction
- getAnnouncements 排序置顶优先

P2-13e 通知分类筛选和桌面推送:
- NotificationList 添加按类型筛选按钮组
- 新增 useDesktopNotifications Hook（浏览器 Notification API）
- NotificationDropdown 集成桌面推送（新通知触发）

架构图同步:
- 004 和 005 均已更新（新增表、Action、Hook、组件描述）

drizzle/0006_notification_logs.sql

@@ -0,0 +1,15 @@
+CREATE TABLE `notification_logs` (
+	`id` varchar(128) PRIMARY KEY NOT NULL,
+	`user_id` varchar(128) NOT NULL,
+	`title` varchar(255) NOT NULL,
+	`channel` varchar(32) NOT NULL,
+	`status` varchar(16) NOT NULL,
+	`message_id` varchar(255),
+	`error` text,
+	`sent_at` timestamp DEFAULT (now()) NOT NULL,
+	CONSTRAINT `notification_logs_user_id_users_id_fk` FOREIGN KEY (`user_id`) REFERENCES `users`(`id`) ON DELETE cascade ON UPDATE no action
+);
+CREATE INDEX `notification_logs_user_idx` ON `notification_logs`(`user_id`);
+CREATE INDEX `notification_logs_channel_idx` ON `notification_logs`(`channel`);
+CREATE INDEX `notification_logs_status_idx` ON `notification_logs`(`status`);
+CREATE INDEX `notification_logs_sent_at_idx` ON `notification_logs`(`sent_at`);

drizzle/0007_notification_priority_archive.sql

@@ -0,0 +1,4 @@
+ALTER TABLE `message_notifications` ADD COLUMN `priority` varchar(16) DEFAULT 'normal' NOT NULL;
+ALTER TABLE `message_notifications` ADD COLUMN `is_archived` boolean DEFAULT false NOT NULL;
+CREATE INDEX `message_notifications_priority_idx` ON `message_notifications`(`priority`);
+CREATE INDEX `message_notifications_user_archived_idx` ON `message_notifications`(`user_id`, `is_archived`);

drizzle/0008_message_star_draft.sql

@@ -0,0 +1,17 @@
+ALTER TABLE `messages` ADD COLUMN `is_starred` boolean DEFAULT false NOT NULL;
+CREATE INDEX `messages_receiver_starred_idx` ON `messages`(`receiver_id`, `is_starred`);
+
+CREATE TABLE `message_drafts` (
+	`id` varchar(128) PRIMARY KEY NOT NULL,
+	`user_id` varchar(128) NOT NULL,
+	`receiver_id` varchar(128),
+	`subject` varchar(255),
+	`content` text,
+	`parent_message_id` varchar(128),
+	`updated_at` timestamp DEFAULT (now()) ON UPDATE now() NOT NULL,
+	`created_at` timestamp DEFAULT (now()) NOT NULL,
+	CONSTRAINT `message_drafts_user_id_users_id_fk` FOREIGN KEY (`user_id`) REFERENCES `users`(`id`) ON DELETE cascade ON UPDATE no action,
+	CONSTRAINT `message_drafts_receiver_id_users_id_fk` FOREIGN KEY (`receiver_id`) REFERENCES `users`(`id`) ON DELETE cascade ON UPDATE no action
+);
+CREATE INDEX `message_drafts_user_idx` ON `message_drafts`(`user_id`);
+CREATE INDEX `message_drafts_user_updated_idx` ON `message_drafts`(`user_id`, `updated_at`);

drizzle/0009_announcement_pin_reads.sql

@@ -0,0 +1,14 @@
+ALTER TABLE `announcements` ADD COLUMN `is_pinned` boolean DEFAULT false NOT NULL;
+CREATE INDEX `announcements_status_pinned_idx` ON `announcements`(`status`, `is_pinned`);
+
+CREATE TABLE `announcement_reads` (
+	`id` varchar(128) PRIMARY KEY NOT NULL,
+	`announcement_id` varchar(128) NOT NULL,
+	`user_id` varchar(128) NOT NULL,
+	`read_at` timestamp DEFAULT (now()) NOT NULL,
+	CONSTRAINT `announcement_reads_announcement_id_announcements_id_fk` FOREIGN KEY (`announcement_id`) REFERENCES `announcements`(`id`) ON DELETE cascade ON UPDATE no action,
+	CONSTRAINT `announcement_reads_user_id_users_id_fk` FOREIGN KEY (`user_id`) REFERENCES `users`(`id`) ON DELETE cascade ON UPDATE no action
+);
+CREATE INDEX `announcement_reads_announcement_idx` ON `announcement_reads`(`announcement_id`);
+CREATE INDEX `announcement_reads_user_idx` ON `announcement_reads`(`user_id`);
+CREATE UNIQUE INDEX `announcement_reads_unique_idx` ON `announcement_reads`(`announcement_id`, `user_id`);