feat: add functional plugin icons

plugins/cjysa-presentations/.codex-plugin/plugin.json

@@ -20,6 +20,8 @@
     "capabilities": ["Interactive", "Read", "Write"],
     "websiteURL": "https://git.cjysa.top/CJYSA/codex-free-market",
     "brandColor": "#C43E1C",
+    "composerIcon": "./assets/icon.png",
+    "logo": "./assets/logo.png",
     "defaultPrompt": [
       "根据这份材料制作一套结构清晰的 PPT。",
       "保留模板风格并修改这个演示文稿。",

plugins/cjysa-presentations/assets/icon.svg

@@ -0,0 +1,7 @@
+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 512 512">
+  <rect width="512" height="512" rx="112" fill="#C43E1C"/>
+  <rect x="104" y="114" width="304" height="226" rx="18" fill="#fff"/>
+  <path d="M256 340v58M188 398h136" stroke="#fff" stroke-width="24" stroke-linecap="round"/>
+  <path d="M154 292v-62h48v62M232 292v-112h48v112M310 292v-88h48v88" fill="#FED7AA" stroke="#C43E1C" stroke-width="12"/>
+  <path d="M138 340h236" stroke="#FED7AA" stroke-width="14"/>
+</svg>