feat: rename project to 天书 TianShu, add logo and slogan

public/logo.svg

@@ -0,0 +1,47 @@
+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 400 140" width="400" height="140">
+  <defs>
+    <linearGradient id="g1" x1="0" y1="0" x2="1" y2="1">
+      <stop offset="0%" stop-color="#c9a84c"/>
+      <stop offset="100%" stop-color="#8b6914"/>
+    </linearGradient>
+    <linearGradient id="g2" x1="0" y1="0" x2="1" y2="0">
+      <stop offset="0%" stop-color="#8b6914"/>
+      <stop offset="50%" stop-color="#c9a84c"/>
+      <stop offset="100%" stop-color="#8b6914"/>
+    </linearGradient>
+    <filter id="glow">
+      <feGaussianBlur stdDeviation="1.5" result="blur"/>
+      <feMerge>
+        <feMergeNode in="blur"/>
+        <feMergeNode in="SourceGraphic"/>
+      </feMerge>
+    </filter>
+  </defs>
+
+  <!-- Background card -->
+  <rect x="10" y="5" width="380" height="130" rx="12" fill="#1a1410"/>
+
+  <!-- Decorative river/book lines -->
+  <path d="M50,110 Q200,70 350,110" stroke="url(#g2)" stroke-width="0.8" fill="none" opacity="0.15"/>
+  <path d="M60,115 Q200,80 340,115" stroke="url(#g2)" stroke-width="0.5" fill="none" opacity="0.1"/>
+
+  <!-- Main char 天 -->
+  <text x="70" y="55" font-family="serif" font-size="52" font-weight="bold" fill="url(#g1)" filter="url(#glow)">天</text>
+
+  <!-- Main char 书 -->
+  <text x="140" y="55" font-family="serif" font-size="52" font-weight="bold" fill="url(#g1)" filter="url(#glow)">书</text>
+
+  <!-- Vertical divider -->
+  <line x1="220" y1="20" x2="220" y2="58" stroke="url(#g2)" stroke-width="0.6" opacity="0.3"/>
+
+  <!-- English subtitle -->
+  <text x="70" y="78" font-family="Georgia, serif" font-size="11" fill="#6b5b3a" letter-spacing="4">TIANSHU</text>
+
+  <!-- Slogan -->
+  <text x="70" y="100" font-family="system-ui, sans-serif" font-size="11" fill="#4a3a2a" letter-spacing="3">天书不晦 · 落笔成途</text>
+
+  <!-- Small decorative elements -->
+  <circle cx="355" cy="30" r="12" fill="none" stroke="#8b6914" stroke-width="0.5" opacity="0.2"/>
+  <circle cx="355" cy="30" r="8" fill="none" stroke="#c9a84c" stroke-width="0.4" opacity="0.15"/>
+  <circle cx="355" cy="30" r="2" fill="#8b6914" opacity="0.3"/>
+</svg>