refactor(navigation): consolidate navigation with href helpers and extract push device hook

- Migrate all navigation calls from magic strings to centralized href helpers
- Extract inline device registration logic into useRegisterPushDevice hook
- Remove unused terms and privacy policy routes from profile stack
- Add hrefTradeDetail helper for trade detail navigation
- Restore routePayloadCache.stashSystemMessage for group request/invite handling
- Change desktop shell tab navigation from replace to push

src/screens/home/HomeScreen.tsx

@@ -716,7 +716,7 @@ export const HomeScreen: React.FC = () => {
   // 跳转到发帖页面（使用 Modal 方式）
   const handleCreatePost = () => {
     if (!isAuthenticated) {
-      router.push('/login');
+      router.push(hrefs.hrefAuthLogin());
       return;
     }
     if (!isVerified) {
@@ -1052,7 +1052,7 @@ export const HomeScreen: React.FC = () => {
           floatingButtonBottom !== undefined && { bottom: floatingButtonBottom },
         ]}
         onPress={homeTab === 'market' ? () => {
-          if (!isAuthenticated) { router.push('/login'); return; }
+          if (!isAuthenticated) { router.push(hrefs.hrefAuthLogin()); return; }
           if (!isVerified) { router.push(hrefs.hrefVerificationGuide()); return; }
           setShowCreateTrade(true);
         } : handleCreatePost}

src/screens/home/MarketView.tsx

@@ -14,6 +14,7 @@ import type {
 } from '../../types/trade';
 import { useRouter } from 'expo-router';
 import { useResponsive, useResponsiveSpacing } from '../../hooks';
+import * as hrefs from '../../navigation/hrefs';
 
 type TradeFilterType = 'all' | 'sell' | 'buy';
 
@@ -137,7 +138,7 @@ export function MarketView({
   }, [isLoadingMore, hasMore, cursor, filterType, selectedCategory]);
 
   const handlePressItem = useCallback((id: string) => {
-    router.push(`/trade/${id}` as any);
+    router.push(hrefs.hrefTradeDetail(id));
   }, [router]);
 
   const handleFavorite = useCallback(async (id: string) => {

src/screens/home/SearchScreen.tsx

@@ -472,7 +472,7 @@ export const SearchScreen: React.FC<SearchScreenProps> = ({ onBack, homeTab = 's
             <TradeCard
               item={item}
               variant="list"
-              onPress={(id) => router.push(`/trade/${id}` as any)}
+              onPress={(id) => router.push(hrefs.hrefTradeDetail(id))}
             />
           </View>
         )}

src/screens/message/NotificationsScreen.tsx

@@ -38,7 +38,7 @@ import { SystemMessageItem } from '../../components/business';
 import { Text, ResponsiveContainer, AppBackButton } from '../../components/common';
 import { useCursorPagination } from '../../hooks/useCursorPagination';
 import * as hrefs from '../../navigation/hrefs';
-import { useMessageManagerSystemUnreadCount } from '../../stores';
+import { useMessageManagerSystemUnreadCount, routePayloadCache } from '../../stores';
 import { messageManager } from '../../stores/message';
 
 const MESSAGE_TYPES = [
@@ -331,8 +331,10 @@ export const NotificationsScreen: React.FC<{ onBack?: () => void }> = ({ onBack
           router.push(hrefs.hrefUserProfile(extra_data.actor_id_str));
         }
       } else if (system_type === 'group_join_apply') {
+        routePayloadCache.stashSystemMessage(message);
         router.push(hrefs.hrefGroupRequestDetail(message));
       } else if (system_type === 'group_invite') {
+        routePayloadCache.stashSystemMessage(message);
         router.push(hrefs.hrefGroupInviteDetail(message));
       }
       // 其他类型暂不处理跳转