初始提交：姜十三论坛 Jiang13 Forum

轻量自用论坛，Go 单二进制 + React SPA 内嵌 + SQLite。

Co-authored-by: Cursor <cursoragent@cursor.com>

embed_static/templates/user_profile.html

@@ -0,0 +1,8 @@
+{{define "user_profile.html"}}{{template "layout" .}}{{end}}
+{{define "content"}}
+<div class="text-center py-4">
+  <img src="{{if .ProfileUser.Avatar}}{{.ProfileUser.Avatar}}{{else}}https://via.placeholder.com/128{{end}}" class="avatar-md mb-2">
+  <h3>{{.ProfileUser.Nickname}}</h3>
+  <p class="text-muted">@{{.ProfileUser.Username}} · 注册于 {{.ProfileUser.CreatedAt.Format "2006-01-02"}}</p>
+</div>
+{{end}}