feat(profiles): add private notes field per profile, visible only to owner

app/templates/profiles.html

@@ -48,6 +48,14 @@
                 <span class="stat-label">国家</span>
             </div>
         </div>
+        <div class="profile-card-notes" style="padding:0 .75rem">
+            <form method="post" action="/profiles/{{ p.id }}/notes" style="display:flex;flex-direction:column;gap:.3rem">
+                <textarea name="notes" rows="2" placeholder="备注（仅自己可见）" style="width:100%;padding:.4rem .6rem;border:1px solid var(--border);border-radius:6px;font-size:.85rem;resize:vertical;font-family:inherit">{{ p.notes }}</textarea>
+                <div style="display:flex;justify-content:flex-end">
+                    <button type="submit" class="btn btn-sm">保存</button>
+                </div>
+            </form>
+        </div>
         <div class="profile-card-footer">
             <span class="profile-card-date">创建于 {{ p.created_at.strftime('%Y-%m-%d') }}</span>
             <div class="profile-card-actions">