feat: support assistant frontend (#2139)

Co-authored-by: StyleZhang <jasonapring2015@outlook.com>

web/app/components/base/icons/assets/public/header-nav/knowledge/knowledge-active.svg

@@ -0,0 +1,3 @@
+<svg width="16" height="16" viewBox="0 0 16 16" fill="none" xmlns="http://www.w3.org/2000/svg">
+<path fill-rule="evenodd" clip-rule="evenodd" d="M4.0625 0.5C2.92341 0.5 2 1.42341 2 2.5625V13.4375C2 14.5766 2.92341 15.5 4.0625 15.5H12.6875C13.4124 15.5 14 14.9124 14 14.1875V1.8125C14 1.08763 13.4124 0.5 12.6875 0.5H4.0625ZM3.125 13.25V13.4375C3.125 13.9553 3.54473 14.375 4.0625 14.375H12.6875C12.7911 14.375 12.875 14.2911 12.875 14.1875V12.1117C12.8138 12.1205 12.7512 12.125 12.6875 12.125H4.25C3.62868 12.125 3.125 12.6287 3.125 13.25ZM5.5625 3.6875C5.25184 3.6875 5 3.93934 5 4.25C5 4.56066 5.25184 4.8125 5.5625 4.8125H10.4375C10.7482 4.8125 11 4.56066 11 4.25C11 3.93934 10.7482 3.6875 10.4375 3.6875H5.5625ZM5 7.25C5 6.93934 5.25184 6.6875 5.5625 6.6875H8.1875C8.49816 6.6875 8.75 6.93934 8.75 7.25C8.75 7.56066 8.49816 7.8125 8.1875 7.8125H5.5625C5.25184 7.8125 5 7.56066 5 7.25Z" fill="#155EEF"/>
+</svg>

web/app/components/base/icons/assets/public/header-nav/knowledge/knowledge.svg

@@ -0,0 +1,3 @@
+<svg width="16" height="16" viewBox="0 0 16 16" fill="none" xmlns="http://www.w3.org/2000/svg">
+<path d="M13.4375 8V10.8125C13.4375 11.2267 13.1017 11.5625 12.6875 11.5625H4.25C3.31802 11.5625 2.5625 12.318 2.5625 13.25C2.5625 14.182 3.31802 14.9375 4.25 14.9375H6.5M5.5625 4.25H10.4375M5.5625 7.25H8.1875M4.0625 1.0625H12.6875C13.1017 1.0625 13.4375 1.39829 13.4375 1.8125V14.1875C13.4375 14.6017 13.1017 14.9375 12.6875 14.9375H4.0625C3.23407 14.9375 2.5625 14.2659 2.5625 13.4375V2.5625C2.5625 1.73407 3.23407 1.0625 4.0625 1.0625Z" stroke="#667085" stroke-width="1.5" stroke-linecap="round" stroke-linejoin="round"/>
+</svg>