feat: settings页面改名为problems，移除调试代码

app/templates/base.html

@@ -95,7 +95,7 @@
                     <a class="nav-link {% if active_nav == 'plans' %}active{% endif %}" href="/plans">
                         <i class="bi bi-clipboard-check"></i> 方案管理
                     </a>
-                    <a class="nav-link {% if active_nav == 'settings' %}active{% endif %}" href="/settings">
+                    <a class="nav-link {% if active_nav == 'problems' %}active{% endif %}" href="/problems">
                         <i class="bi bi-gear"></i> 问题配置
                     </a>
                     <a class="nav-link {% if active_nav == 'classes' %}active{% endif %}" href="/classes">

app/templates/goals.html

@@ -265,7 +265,6 @@ async function saveGoal() {
         });
 
         const result = await res.json();
-        console.log('Save result:', result);
 
         if (res.ok) {
             bootstrap.Modal.getInstance(document.getElementById('goalModal')).hide();