fix: 调整默认主题色并优化数据库连接配置

1.  将默认主题色从#1171c4更改为#e4393c
2.  在druid配置中开启keepAlive，定期检测空闲连接有效性以应对网络抖动

ruoyi-admin/src/main/resources/application-druid.yml

@@ -39,6 +39,8 @@ spring:
             testWhileIdle: true
             testOnBorrow: false
             testOnReturn: false
+            # 开启keepAlive，定期检测空闲连接的有效性，网络抖动后自动恢复
+            keepAlive: true
             webStatFilter: 
                 enabled: true
             statViewServlet:

ruoyi-ui/src/store/modules/settings.js

@@ -6,7 +6,7 @@ const { sideTheme, showSettings, navType, tagsView, tagsViewPersist, tagsIcon, t
 const storageSetting = JSON.parse(localStorage.getItem('layout-setting')) || ''
 const state = {
   title: '',
-  theme: storageSetting.theme || '#1171c4',
+  theme: storageSetting.theme || '#e4393c',
   sideTheme: storageSetting.sideTheme || sideTheme,
   showSettings: showSettings,
   navType: storageSetting.navType === undefined ? navType : storageSetting.navType,