feat(assets): replace logo image with SVG format and update favicon; adjust theme color in manifest

public/logo.svg

@@ -0,0 +1,7 @@
+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 48 48" width="512" height="512">
+  <g fill="none">
+    <path d="M34.6 13.4 A15 15 0 1 0 34.6 34.6" stroke="#5559CE" stroke-width="9" stroke-linecap="butt"></path>
+    <line x1="24" y1="24" x2="33" y2="19.5" stroke="#FFB800" stroke-width="3.5" stroke-linecap="round"></line>
+    <circle cx="24" cy="24" r="2.8" fill="#5559CE"></circle>
+  </g>
+</svg>

public/manifest.json

@@ -6,7 +6,7 @@
   "scope": "/admin",
   "display": "standalone",
   "orientation": "portrait-primary",
-  "theme_color": "#5b4fd8",
+  "theme_color": "#5559CE",
   "background_color": "#f8fafc",
   "lang": "fa",
   "dir": "rtl",