Add settings page tabs and show env API keys with last four digits.

System settings now use the same CSS tab layout as env config; sensitive env fields display masked values from .env while keeping save-on-empty behavior.

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

lib/instance/templates/env_config_panel.html

@@ -47,17 +47,25 @@
                             <option value="true"{% if cur in ('true', '1', 'yes', 'on') %} selected{% endif %}>开启</option>
                             <option value="false"{% if cur not in ('true', '1', 'yes', 'on') %} selected{% endif %}>关闭</option>
                         </select>
+                        {% elif field.sensitive %}
+                        {% if field.has_value %}
+                        <div class="env-sensitive-current muted">已配置 <span class="env-masked-value">{{ field.masked }}</span></div>
+                        {% endif %}
+                        <input
+                            class="env-field-input"
+                            id="env-f-{{ field.key }}"
+                            type="password"
+                            data-env-key="{{ field.key }}"
+                            placeholder="{% if field.has_value %}修改时填写新值，留空不修改{% else %}请输入{% endif %}"
+                            autocomplete="off"
+                        >
                         {% else %}
                         <input
                             class="env-field-input"
                             id="env-f-{{ field.key }}"
-                            type="{% if field.sensitive %}password{% else %}text{% endif %}"
+                            type="text"
                             data-env-key="{{ field.key }}"
-                            {% if field.sensitive and field.has_value %}
-                            placeholder="{{ field.masked or '留空不修改' }}"
-                            {% else %}
                             value="{{ field.current or field.default or '' }}"
-                            {% endif %}
                         >
                         {% endif %}
                     </div>