增加 404 页面，新增暗色模式

public/icon/theme/dark.svg

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+<g id="Icon">
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+<path id="Vector_2" d="M4.66667 12.25H9.33333" stroke="#18181B" stroke-opacity="0.8" stroke-width="0.875" stroke-linecap="round" stroke-linejoin="round"/>
+<path id="Vector_3" d="M7 9.91667V12.25" stroke="#18181B" stroke-opacity="0.8" stroke-width="0.875" stroke-linecap="round" stroke-linejoin="round"/>
+</g>
+</svg>

public/icon/theme/light.svg

@@ -0,0 +1,5 @@
+<svg preserveAspectRatio="none" overflow="visible" style="display: block;" width="14" height="14" viewBox="0 0 14 14" fill="none" xmlns="http://www.w3.org/2000/svg">
+<g id="Icon">
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+</g>
+</svg>

public/icon/theme/system.svg

@@ -0,0 +1,18 @@
+<svg preserveAspectRatio="none" overflow="visible" style="display: block;" width="14" height="14" viewBox="0 0 14 14" fill="none" xmlns="http://www.w3.org/2000/svg">
+<g id="Icon" clip-path="url(#clip0_0_24)">
+<path id="Vector" d="M7 9.91667C8.61083 9.91667 9.91667 8.61083 9.91667 7C9.91667 5.38917 8.61083 4.08333 7 4.08333C5.38917 4.08333 4.08333 5.38917 4.08333 7C4.08333 8.61083 5.38917 9.91667 7 9.91667Z" stroke="#18181B" stroke-opacity="0.8" stroke-width="0.875" stroke-linecap="round" stroke-linejoin="round"/>
+<path id="Vector_2" d="M7 0.583334V1.75" stroke="#18181B" stroke-opacity="0.8" stroke-width="0.875" stroke-linecap="round" stroke-linejoin="round"/>
+<path id="Vector_3" d="M7 12.25V13.4167" stroke="#18181B" stroke-opacity="0.8" stroke-width="0.875" stroke-linecap="round" stroke-linejoin="round"/>
+<path id="Vector_4" d="M2.46167 2.46167L3.29 3.29" stroke="#18181B" stroke-opacity="0.8" stroke-width="0.875" stroke-linecap="round" stroke-linejoin="round"/>
+<path id="Vector_5" d="M10.71 10.71L11.5383 11.5383" stroke="#18181B" stroke-opacity="0.8" stroke-width="0.875" stroke-linecap="round" stroke-linejoin="round"/>
+<path id="Vector_6" d="M0.583334 7H1.75" stroke="#18181B" stroke-opacity="0.8" stroke-width="0.875" stroke-linecap="round" stroke-linejoin="round"/>
+<path id="Vector_7" d="M12.25 7H13.4167" stroke="#18181B" stroke-opacity="0.8" stroke-width="0.875" stroke-linecap="round" stroke-linejoin="round"/>
+<path id="Vector_8" d="M2.46167 11.5383L3.29 10.71" stroke="#18181B" stroke-opacity="0.8" stroke-width="0.875" stroke-linecap="round" stroke-linejoin="round"/>
+<path id="Vector_9" d="M10.71 3.29L11.5383 2.46167" stroke="#18181B" stroke-opacity="0.8" stroke-width="0.875" stroke-linecap="round" stroke-linejoin="round"/>
+</g>
+<defs>
+<clipPath id="clip0_0_24">
+<rect width="14" height="14" fill="white"/>
+</clipPath>
+</defs>
+</svg>