完善接单平台通知配置

apps/backend/src/db/migrations/027_admin_notifications.sql

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+-- 后台待办通知：业务状态驱动，多个后台账号共享处理状态。
+CREATE TABLE IF NOT EXISTS admin_notifications (
+  id BIGSERIAL PRIMARY KEY,
+  notification_type TEXT NOT NULL,
+  priority TEXT NOT NULL DEFAULT 'normal',
+  entity_type TEXT NOT NULL,
+  entity_id BIGINT NOT NULL,
+  dedupe_key TEXT NOT NULL UNIQUE,
+  title TEXT NOT NULL,
+  body TEXT NOT NULL DEFAULT '',
+  action_path TEXT NOT NULL DEFAULT '',
+  payload_json JSONB NOT NULL DEFAULT '{}'::jsonb,
+  reminder_count INTEGER NOT NULL DEFAULT 0,
+  last_reminded_at TIMESTAMPTZ,
+  status TEXT NOT NULL DEFAULT 'pending',
+  resolved_at TIMESTAMPTZ,
+  resolution_reason TEXT NOT NULL DEFAULT '',
+  created_at TIMESTAMPTZ NOT NULL,
+  updated_at TIMESTAMPTZ NOT NULL
+);
+
+CREATE INDEX IF NOT EXISTS idx_admin_notifications_pending
+  ON admin_notifications (status, priority, updated_at DESC);
+
+CREATE INDEX IF NOT EXISTS idx_admin_notifications_entity
+  ON admin_notifications (entity_type, entity_id);
+
+COMMENT ON TABLE admin_notifications IS '后台共享业务待办通知，不使用个人已读状态';
+COMMENT ON COLUMN admin_notifications.dedupe_key IS '同一业务待办的唯一标识';

apps/backend/src/db/migrations/028_admin_notification_visibility.sql

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+-- 隐藏待办用于保留业务催办状态，不展示在后台铃铛中。
+ALTER TABLE admin_notifications
+  ADD COLUMN IF NOT EXISTS visible BOOLEAN NOT NULL DEFAULT TRUE;
+
+-- 每条待办保存创建或更新当时的声音开关，配置调整不影响历史待办。
+ALTER TABLE admin_notifications
+  ADD COLUMN IF NOT EXISTS sound_enabled BOOLEAN NOT NULL DEFAULT TRUE;
+
+CREATE INDEX IF NOT EXISTS idx_admin_notifications_visible_pending
+  ON admin_notifications (visible, status, priority, updated_at DESC);
+
+COMMENT ON COLUMN admin_notifications.visible IS '是否展示在后台待办铃铛中';
+COMMENT ON COLUMN admin_notifications.sound_enabled IS '该次待办更新是否允许浏览器声音播报';