feat: AcFun tools plugin for DeepSeek Harness

Eight tools (search, video, comments, danmaku, rank, playurl, interact,
post_comment) over acfun.cn's public web API, a model-facing skill, a
bundle patch with a skill-filesystem row, and offline/live checks.

Reads are anonymous; writes require allowWriteActions plus a login cookie.

icon.svg

@@ -0,0 +1,16 @@
+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 64 64" width="64" height="64" role="img" aria-label="AcFun tools">
+  <defs>
+    <linearGradient id="bg" x1="0" y1="0" x2="1" y2="1">
+      <stop offset="0" stop-color="#fd6b6b"/>
+      <stop offset="1" stop-color="#c81f4d"/>
+    </linearGradient>
+    <linearGradient id="play" x1="0" y1="0" x2="1" y2="1">
+      <stop offset="0" stop-color="#fff8f0"/>
+      <stop offset="1" stop-color="#ffe1c4"/>
+    </linearGradient>
+  </defs>
+  <rect x="2" y="2" width="60" height="60" rx="16" fill="url(#bg)"/>
+  <rect x="2.75" y="2.75" width="58.5" height="58.5" rx="15.25" fill="none" stroke="#ffffff" stroke-opacity="0.35" stroke-width="1.5"/>
+  <path d="M19 45 L27.5 19 H36.5 L45 45 H37.6 L35.9 39.2 H28.1 L26.4 45 Z M30.2 32.6 H33.8 L32 25.6 Z" fill="url(#play)"/>
+  <path d="M33.4 12.5 L39.6 8.6 L40.9 11.4 L34.7 15.3 Z" fill="#ffffff" fill-opacity="0.55"/>
+</svg>