feat(icons): 应用图标定稿 B 版（米纸底大 M），Tauri 工具生成全套 ico/icns/png，含安装包图标

icons-src/icon-a.svg

@@ -0,0 +1,13 @@
+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 1024 1024">
+  <defs>
+    <linearGradient id="gradA" x1="0" y1="0" x2="0" y2="1">
+      <stop offset="0" stop-color="#4A5B74"/>
+      <stop offset="1" stop-color="#39485E"/>
+    </linearGradient>
+  </defs>
+  <rect x="64" y="64" width="896" height="896" rx="200" fill="url(#gradA)"/>
+  <path d="M320 212 h300 l112 112 v460 a28 28 0 0 1 -28 28 h-384 a28 28 0 0 1 -28 -28 v-544 a28 28 0 0 1 28 -28 z" fill="#F7F3EA"/>
+  <path d="M620 212 l112 112 h-84 a28 28 0 0 1 -28 -28 z" fill="#DFD8C6"/>
+  <path d="M392 616 V408 L512 528 L632 408 V616" fill="none" stroke="#39485E" stroke-width="46" stroke-linecap="round" stroke-linejoin="round"/>
+  <path d="M456 672 L512 726 L568 672" fill="none" stroke="#39485E" stroke-width="42" stroke-linecap="round" stroke-linejoin="round"/>
+</svg>

icons-src/icon-b.svg

@@ -0,0 +1,6 @@
+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 1024 1024">
+  <rect x="64" y="64" width="896" height="896" rx="200" fill="#F3EEE3"/>
+  <rect x="64" y="64" width="896" height="896" rx="200" fill="none" stroke="#E2D9C4" stroke-width="10"/>
+  <path d="M216 716 V308 L512 556 L808 308 V716" fill="none" stroke="#2E3440" stroke-width="94" stroke-linecap="round" stroke-linejoin="round"/>
+  <path d="M434 786 L512 856 L590 786" fill="none" stroke="#43536A" stroke-width="58" stroke-linecap="round" stroke-linejoin="round"/>
+</svg>