feat(life): add Life Post detail page and endpoint

Implement GET /api/life-posts/:id with moderation and visibility rules
Add /life/:id route and LifePostDetail view
Update feeds and user profiles to link to the new detail page

system-wordings.ts

@@ -793,6 +793,11 @@ export const systemWordingMessages = {
         title: 'Life',
         subtitle: 'Share favourite thoughts, tips, and community finds.',
         kicker: 'Community Feed',
+        detailTitle: 'Life Post',
+        detailSubtitle: 'Read this community post and its discussion.',
+        detailKicker: 'Life Detail',
+        backToLife: 'Back to Life',
+        viewPost: 'View post',
         composerTitle: 'Share something',
         composerPrompt: 'What would you like to share?',
         bodyLabel: 'Post',
@@ -2019,6 +2024,11 @@ export const systemWordingMessages = {
         title: 'Life',
         subtitle: '分享喜欢的心得、想法和社区发现。',
         kicker: '社区动态',
+        detailTitle: 'Life 动态',
+        detailSubtitle: '查看这条社区动态和相关讨论。',
+        detailKicker: 'Life 详情',
+        backToLife: '返回 Life',
+        viewPost: '查看动态',
         composerTitle: '分享动态',
         composerPrompt: '想分享什么？',
         bodyLabel: '动态内容',