增加 404 页面，新增暗色模式

public/error/404-messages.yml

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+# Random 404 messages grouped by locale.
+zh-CN:
+  - 人与人的悲欢不尽相同
+  - 此处没有列车经过
+  - 这条线路还没有开通
+  - 你抵达了地图之外的地方
+zh-TW:
+  - 人與人的悲歡並不相同
+  - 此處沒有列車經過
+  - 這條路線尚未通車
+  - 你抵達了地圖之外的地方
+en:
+  - We do not all share the same joys and sorrows
+  - No train stops here
+  - This line has not opened yet
+  - You have reached the edge of the map
+ja:
+  - 人それぞれ、喜びも悲しみも違う
+  - ここを通る列車はありません
+  - この路線はまだ開通していません
+  - 地図の外まで来てしまいました

public/icon/theme/dark.svg

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+<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">
+<path id="Vector" d="M11.6667 1.75H2.33333C1.689 1.75 1.16667 2.27233 1.16667 2.91667V8.75C1.16667 9.39433 1.689 9.91667 2.33333 9.91667H11.6667C12.311 9.91667 12.8333 9.39433 12.8333 8.75V2.91667C12.8333 2.27233 12.311 1.75 11.6667 1.75Z" stroke="#18181B" stroke-opacity="0.8" stroke-width="0.875" stroke-linecap="round" stroke-linejoin="round"/>
+<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

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+<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">
+<path id="Vector" d="M12.25 7.46083C12.1582 8.45379 11.7856 9.40007 11.1756 10.189C10.5657 10.9778 9.7437 11.5767 8.80583 11.9155C7.86795 12.2542 6.85299 12.3189 5.87971 12.1019C4.90643 11.8849 4.01508 11.3952 3.30996 10.69C2.60485 9.98492 2.11513 9.09357 1.89811 8.12029C1.68109 7.14701 1.74575 6.13205 2.08452 5.19417C2.42329 4.2563 3.02215 3.4343 3.81104 2.82436C4.59993 2.21442 5.54621 1.84176 6.53917 1.75C5.95782 2.53649 5.67808 3.50551 5.75081 4.48083C5.82354 5.45614 6.24392 6.37295 6.93548 7.06452C7.62705 7.75608 8.54386 8.17646 9.51918 8.24919C10.4945 8.32192 11.4635 8.04218 12.25 7.46083Z" stroke="#18181B" stroke-opacity="0.8" stroke-width="0.875" stroke-linecap="round" stroke-linejoin="round"/>
+</g>
+</svg>

public/icon/theme/system.svg

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+<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>