功能(提醒)：统一项目提醒中心与桌面通知链路

增加通用提醒状态、数据库迁移和定时同步，覆盖风险时效、文件回执、项目里程碑、访视窗口与协作申请。

新增网页端和桌面端提醒中心、真实投递诊断与固定隐私通知正文，并补齐登录来源聚合、测试和说明文档。

frontend/src/composables/useProjectNotifications.ts

@@ -1,6 +1,10 @@
 import { computed, ref } from "vue";
 import { useRoute, useRouter } from "vue-router";
-import { listGeneralNotifications, markGeneralNotificationRead } from "../api/notifications";
+import {
+  listGeneralNotifications,
+  markAllGeneralNotificationsRead,
+  markGeneralNotificationRead,
+} from "../api/notifications";
 import { useStudyStore } from "../store/study";
 import type { GeneralNotificationFeed, GeneralNotificationItem } from "../types/notifications";
 
@@ -32,7 +36,7 @@ export const useProjectNotifications = () => {
   const route = useRoute();
   const router = useRouter();
   const headerRemindersLoading = ref(false);
-  const feed = ref<GeneralNotificationFeed>({ unread_count: 0, items: [] });
+  const feed = ref<GeneralNotificationFeed>({ unread_count: 0, total_count: 0, items: [] });
   let requestId = 0;
   let pollTimer: number | undefined;
 
@@ -40,12 +44,12 @@ export const useProjectNotifications = () => {
     const studyId = study.currentStudy?.id;
     const currentRequest = ++requestId;
     if (!studyId || route.path.startsWith("/admin")) {
-      feed.value = { unread_count: 0, items: [] };
+      feed.value = { unread_count: 0, total_count: 0, items: [] };
       return;
     }
     headerRemindersLoading.value = true;
     try {
-      const { data } = await listGeneralNotifications(studyId, 10);
+      const { data } = await listGeneralNotifications(studyId, { limit: 10 });
       if (currentRequest === requestId && study.currentStudy?.id === studyId) feed.value = data;
     } catch {
       // 短时网络异常时保留当前内存中的提醒，避免角标在轮询失败时闪烁消失。
@@ -67,6 +71,17 @@ export const useProjectNotifications = () => {
   const headerReminderBadgeValue = computed(() => headerReminderTotal.value > 99 ? "99+" : headerReminderTotal.value);
 
   const handleReminderCommand = async (command: string) => {
+    if (command === "notification:center") {
+      await router.push("/project/notifications");
+      return;
+    }
+    if (command === "notification:read-all") {
+      const studyId = study.currentStudy?.id;
+      if (!studyId || feed.value.unread_count <= 0) return;
+      await markAllGeneralNotificationsRead(studyId);
+      await loadHeaderReminders();
+      return;
+    }
     if (!command.startsWith("notification:")) return;
     const notificationId = command.slice("notification:".length);
     const item = feed.value.items.find((candidate) => candidate.id === notificationId);
@@ -75,10 +90,15 @@ export const useProjectNotifications = () => {
     if (!item.read_at) {
       item.read_at = new Date().toISOString();
       feed.value.unread_count = Math.max(0, feed.value.unread_count - 1);
-      await markGeneralNotificationRead(studyId, item.id).catch(() => {
+      const response = await markGeneralNotificationRead(studyId, item.id).catch(() => {
         item.read_at = null;
         feed.value.unread_count += 1;
+        return null;
       });
+      if (response?.data.resolved_at) {
+        feed.value.items = feed.value.items.filter((candidate) => candidate.id !== item.id);
+        feed.value.total_count = Math.max(0, feed.value.total_count - 1);
+      }
     }
     if (item.action_path?.startsWith("/")) await router.push(item.action_path);
   };