构建列表操作按钮修正：成功任务不再显示重试，统一操作列排版

- 成功状态的构建记录不再显示「重试」按钮，仅保留下载产物/日志/删除；
  失败、取消、超时仍保留一键重试（线上核对确认仅新快照成功任务误显示）
- retry_build 后端增加 success 状态拦截，防止绕过页面直接 POST
- 操作列改为统一 flex 容器（flex-wrap + gap），按钮数量随状态变化时
  间距一致、左对齐、窄屏自动换行；后台任务管理页同款统一

rdgenerator/templates/dashboard.html

@@ -49,7 +49,8 @@
                 <td>{{ run.platform_label }}</td>
                 <td><span class="badge {{ run.status_badge }} {% if not run.is_finished %}badge-dot{% endif %}">{{ run.status_label }}</span></td>
                 <td class="mono text-muted">{{ run.short_uuid }}</td>
-                <td style="white-space:nowrap">
+                <td class="col-actions">
+                  <div class="row-actions">
                     <a class="btn btn-secondary btn-sm"
                        href="/check_for_file?filename={{ run.filename|urlencode }}&uuid={{ run.uuid|urlencode }}&platform={{ run.platform|urlencode }}">查看</a>
                     <form method="post" class="inline-form" action="{% url 'delete_build' run.id %}"
@@ -59,6 +60,7 @@
                             <svg class="icon"><use href="#i-trash"/></svg> 删除
                         </button>
                     </form>
+                  </div>
                 </td>
             </tr>
             {% endfor %}

rdgenerator/templates/my_builds.html

@@ -32,7 +32,8 @@
                 <td><span class="badge {{ run.backend_badge_class }}">{{ run.backend_label }}</span></td>
                 <td><span class="badge {{ run.status_badge }} {% if not run.is_finished %}badge-dot{% endif %}">{{ run.status_label }}</span></td>
                 <td class="mono text-muted">{{ run.short_uuid }}</td>
-                <td style="white-space:nowrap">
+                <td class="col-actions">
+                  <div class="row-actions">
                     <a class="btn btn-secondary btn-sm"
                        href="/check_for_file?filename={{ run.filename|urlencode }}&uuid={{ run.uuid|urlencode }}&platform={{ run.platform|urlencode }}">
                         {% if run.status == 'success' %}<svg class="icon"><use href="#i-download"/></svg> 下载产物{% elif run.is_finished %}<svg class="icon"><use href="#i-eye"/></svg> 查看详情{% else %}<svg class="icon"><use href="#i-eye"/></svg> 查看进度{% endif %}
@@ -42,7 +43,7 @@
                         <svg class="icon"><use href="#i-external"/></svg> 日志
                     </a>
                     {% endif %}
-                    {% if run.is_finished and run.config_data %}
+                    {% if run.is_finished and run.status != 'success' and run.config_data %}
                     <form method="post" class="inline-form" action="{% url 'retry_build' run.id %}"
                           onsubmit="return confirm('将使用该任务的原始配置重新提交一次构建（原任务记录保留），是否继续？');">
                         {% csrf_token %}
@@ -69,6 +70,7 @@
                         </button>
                     </form>
                     {% endif %}
+                  </div>
                 </td>
             </tr>
             {% endfor %}