feat(assets): add initial fonts and image assets

src/app/splash/components/splash-screen.module.css

@@ -8,6 +8,7 @@
   overflow: hidden;
 }
 
+/* 渐变：accent (bottom-left) → transparent (center-right) */
 .gradientOverlay {
   position: absolute;
   inset: 0;
@@ -16,7 +17,7 @@
     var(--color-accent),
     transparent 60%
   );
-  opacity: 0.4;
+  opacity: 0.5;
   z-index: 1;
   pointer-events: none;
 }
@@ -40,7 +41,9 @@
 
 .bottom {
   margin: var(--spacing-xxxl) 0 0 0;
+  font-family: var(--font-athelas);
   font-size: var(--font-size-md);
+  font-weight: 400;
   line-height: 1.5;
   color: rgba(255, 255, 255, 0.9);
   text-align: center;