refactor: 增加svg边框自适应大小属性

frontend/public/board/blue_1.svg

 <?xml version="1.0" encoding="utf-8"?>
 <!-- Generator: Adobe Illustrator 23.0.0, SVG Export Plug-In . SVG Version: 6.00 Build 0)  -->
 <svg version="1.1" id="图层_1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" x="0px" y="0px"
-	 viewBox="0 0 480 300" style="enable-background:new 0 0 480 300;" xml:space="preserve">
+     preserveAspectRatio="none meet" viewBox="0 0 480 300" style="enable-background:new 0 0 480 300;" xml:space="preserve">
 <style type="text/css">
 	.st0{fill:#1094E5;}
 	.st1{opacity:0.75;}

frontend/public/board/blue_2.svg

 <?xml version="1.0" encoding="utf-8"?>
 <!-- Generator: Adobe Illustrator 23.0.0, SVG Export Plug-In . SVG Version: 6.00 Build 0)  -->
 <svg version="1.1" id="图层_1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" x="0px" y="0px"
-	 viewBox="0 0 480 300" style="enable-background:new 0 0 480 300;" xml:space="preserve">
+     preserveAspectRatio="none meet" viewBox="0 0 480 300" style="enable-background:new 0 0 480 300;" xml:space="preserve">
 <style type="text/css">
 	.st0{fill:#1094E5;}
 	.st1{opacity:0.8;fill:#1094E5;}

frontend/public/board/blue_3.svg

 <?xml version="1.0" encoding="utf-8"?>
 <!-- Generator: Adobe Illustrator 23.0.0, SVG Export Plug-In . SVG Version: 6.00 Build 0)  -->
 <svg version="1.1" id="图层_1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" x="0px" y="0px"
-	 viewBox="0 0 480 300" style="enable-background:new 0 0 480 300;" xml:space="preserve">
+     preserveAspectRatio="none meet" viewBox="0 0 480 300" style="enable-background:new 0 0 480 300;" xml:space="preserve">
 <style type="text/css">
 	.st0{fill:#1094E5;}
 </style>

frontend/public/board/blue_4.svg

 <?xml version="1.0" encoding="utf-8"?>
 <!-- Generator: Adobe Illustrator 23.0.0, SVG Export Plug-In . SVG Version: 6.00 Build 0)  -->
 <svg version="1.1" id="图层_1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" x="0px" y="0px"
-	 viewBox="0 0 480 300" style="enable-background:new 0 0 480 300;" xml:space="preserve">
+     preserveAspectRatio="none meet" viewBox="0 0 480 300" style="enable-background:new 0 0 480 300;" xml:space="preserve">
 <style type="text/css">
 	.st0{fill:#1094E5;}
 </style>

frontend/public/board/blue_5.svg

 <?xml version="1.0" encoding="utf-8"?>
 <!-- Generator: Adobe Illustrator 23.0.0, SVG Export Plug-In . SVG Version: 6.00 Build 0)  -->
 <svg version="1.1" id="图层_1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" x="0px" y="0px"
-	 viewBox="0 0 480 300" style="enable-background:new 0 0 480 300;" xml:space="preserve">
+     preserveAspectRatio="none meet" viewBox="0 0 480 300" style="enable-background:new 0 0 480 300;" xml:space="preserve">
 <style type="text/css">
 	.st0{fill:#1094E5;}
 </style>

frontend/public/board/blue_6.svg

 <?xml version="1.0" encoding="utf-8"?>
 <!-- Generator: Adobe Illustrator 23.0.0, SVG Export Plug-In . SVG Version: 6.00 Build 0)  -->
 <svg version="1.1" id="图层_1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" x="0px" y="0px"
-	 viewBox="0 0 480 300" style="enable-background:new 0 0 480 300;" xml:space="preserve">
+     preserveAspectRatio="none meet" viewBox="0 0 480 300" style="enable-background:new 0 0 480 300;" xml:space="preserve">
 <style type="text/css">
 	.st0{fill:#1094E5;}
 	.st1{fill:#1094E5;stroke:#231815;stroke-miterlimit:10;}

frontend/public/board/blue_7.svg

 <?xml version="1.0" encoding="utf-8"?>
 <!-- Generator: Adobe Illustrator 23.0.0, SVG Export Plug-In . SVG Version: 6.00 Build 0)  -->
 <svg version="1.1" id="图层_1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" x="0px" y="0px"
-	 viewBox="0 0 480 300" style="enable-background:new 0 0 480 300;" xml:space="preserve">
+     preserveAspectRatio="none meet" viewBox="0 0 480 300" style="enable-background:new 0 0 480 300;" xml:space="preserve">
 <style type="text/css">
 	.st0{fill:#1094E5;}
 	.st1{fill:none;stroke:#231815;stroke-miterlimit:10;}

frontend/public/board/blue_8.svg

 <?xml version="1.0" encoding="utf-8"?>
 <!-- Generator: Adobe Illustrator 23.0.0, SVG Export Plug-In . SVG Version: 6.00 Build 0)  -->
 <svg version="1.1" id="图层_1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" x="0px" y="0px"
-	 viewBox="0 0 480 300" style="enable-background:new 0 0 480 300;" xml:space="preserve">
+     preserveAspectRatio="none meet" viewBox="0 0 480 300" style="enable-background:new 0 0 480 300;" xml:space="preserve">
 <style type="text/css">
 	.st0{fill:#1094E5;}
 	.st1{opacity:0.25;}

frontend/public/board/blue_9.svg

 <?xml version="1.0" encoding="utf-8"?>
 <!-- Generator: Adobe Illustrator 23.0.0, SVG Export Plug-In . SVG Version: 6.00 Build 0)  -->
 <svg version="1.1" id="图层_1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" x="0px" y="0px"
-	 viewBox="0 0 480 300" style="enable-background:new 0 0 480 300;" xml:space="preserve">
+     preserveAspectRatio="none meet" viewBox="0 0 480 300" style="enable-background:new 0 0 480 300;" xml:space="preserve">
 <style type="text/css">
 	.st0{fill:#1094E5;}
 	.st1{opacity:0.65;}

frontend/public/board/dark_1.svg

 <?xml version="1.0" encoding="utf-8"?>
 <!-- Generator: Adobe Illustrator 23.0.0, SVG Export Plug-In . SVG Version: 6.00 Build 0)  -->
 <svg version="1.1" id="图层_1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" x="0px" y="0px"
-	 viewBox="0 0 480 300" style="enable-background:new 0 0 480 300;" xml:space="preserve">
+     preserveAspectRatio="none meet" viewBox="0 0 480 300" style="enable-background:new 0 0 480 300;" xml:space="preserve">
 <style type="text/css">
 	.st0{fill:#15709E;}
 </style>