feat: add profile rename, all postcard fields required

app/templates/profiles.html

@@ -19,6 +19,10 @@
             <td><a href="/profiles/{{ p.id }}/postcards">{{ p.nickname }}</a></td>
             <td>{{ p.created_at.strftime('%Y-%m-%d %H:%M') }}</td>
             <td>
+                <form method="post" action="/profiles/{{ p.id }}/rename" class="inline rename-form">
+                    <input type="text" name="nickname" value="{{ p.nickname }}" required>
+                    <button type="submit" class="btn btn-sm">改名</button>
+                </form>
                 <form method="post" action="/profiles/{{ p.id }}/delete" class="inline">
                     <button type="submit" class="btn btn-danger btn-sm" onclick="return confirm('确定删除该 Profile 及其所有明信片？')">删除</button>
                 </form>