Fix env config tabs with CSS radio labels, no JS required

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

lib/instance/templates/env_config_panel.html

@@ -1,4 +1,4 @@
-{# env配置：Tab 分类 + 双列表单，顶部统一保存 #}
+{# env配置：CSS Tab（无需 JS）+ 双列表单 #}
 <div class="env-config-page">
     <div class="env-config-head card">
         <div class="env-config-head-row">
@@ -17,14 +17,17 @@
 
     {% if env_config_groups %}
     <div class="env-config-body card" data-env-ssr="1" id="env-config-body">
+        {% for group in env_config_groups %}
+        <input type="radio" name="env-section" id="env-sec-{{ loop.index0 }}" class="env-tab-radio"{% if loop.first %} checked{% endif %}>
+        {% endfor %}
         <div class="env-config-tabs" role="tablist" aria-label="配置分类">
             {% for group in env_config_groups %}
-            <button type="button" class="env-tab-btn{% if loop.first %} is-active{% endif %}" role="tab" data-env-tab="{{ loop.index0 }}" aria-selected="{{ 'true' if loop.first else 'false' }}">{{ group.title }}</button>
+            <label for="env-sec-{{ loop.index0 }}" class="env-tab-btn" role="tab">{{ group.title }}</label>
             {% endfor %}
         </div>
         <div class="env-config-panels" id="env-config-grid">
             {% for group in env_config_groups %}
-            <section class="env-panel{% if loop.first %} is-active{% endif %}" role="tabpanel" data-env-panel="{{ loop.index0 }}"{% if not loop.first %} hidden{% endif %}>
+            <section class="env-panel env-panel--{{ loop.index0 }}" role="tabpanel">
                 {% if group.has_restart %}
                 <p class="env-panel-hint">本组含需重启项，修改后请点「保存并重启」。</p>
                 {% endif %}