feat: 初始化画个标仓库 - AI驱动设计系统(BYOK模式) - 224源/371504图标+25海报源+130技能

js/core/poster-exporter.js

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+/**
+ * 画个标 · 海报导出：SVG / PNG（按画布规格导出）
+ */
+const HGB_PosterExporter = (function () {
+  'use strict';
+
+  function buildSvg(spec, elements) {
+    return HGB_PosterRenderer.render(spec, elements);
+  }
+
+  function download(name, blob) {
+    const a = document.createElement('a');
+    a.href = URL.createObjectURL(blob);
+    a.download = name;
+    document.body.appendChild(a);
+    a.click();
+    setTimeout(() => { URL.revokeObjectURL(a.href); a.remove(); }, 0);
+  }
+
+  function exportSvg(spec, elements, base) {
+    const svg = buildSvg(spec, elements);
+    download((base || '海报') + '.svg', new Blob([svg], { type: 'image/svg+xml' }));
+  }
+
+  /** 渲染 SVG 到位图并下载（scale 控制放大倍数，默认 1） */
+  function svgToCanvas(spec, elements, scale) {
+    return new Promise((resolve, reject) => {
+      const svg = buildSvg(spec, elements);
+      const img = new Image();
+      img.onload = () => {
+        const w = Math.round(spec.w * scale), h = Math.round(spec.h * scale);
+        const c = document.createElement('canvas');
+        c.width = w; c.height = h;
+        const ctx = c.getContext('2d');
+        ctx.drawImage(img, 0, 0, w, h);
+        resolve(c);
+      };
+      img.onerror = () => reject(new Error('SVG 渲染失败'));
+      img.src = 'data:image/svg+xml;charset=utf-8,' + encodeURIComponent(svg);
+    });
+  }
+
+  async function exportPng(spec, elements, base, scale) {
+    const c = await svgToCanvas(spec, elements, scale || 1);
+    const blob = await new Promise(res => c.toBlob(res, 'image/png'));
+    download((base || '海报') + '.png', blob);
+  }
+
+  return { buildSvg, exportSvg, exportPng, svgToCanvas };
+})();