feat: chat integration, tenant admin spec, backend chat service, miniprogram updates, DEMO moved to tmp, XCX-TEST removed, migrations & docs

tmp/DEMO-miniprogram/miniprogram/assets/icons/heart-filled.svg

@@ -0,0 +1,22 @@
+<!-- 实心爱心 - 华丽版 -->
+<svg width="48" height="48" viewBox="0 0 48 48" fill="none" xmlns="http://www.w3.org/2000/svg">
+  <!-- 外发光 -->
+  <defs>
+    <filter id="glow">
+      <feGaussianBlur stdDeviation="2" result="coloredBlur"/>
+      <feMerge>
+        <feMergeNode in="coloredBlur"/>
+        <feMergeNode in="SourceGraphic"/>
+      </feMerge>
+    </filter>
+    <linearGradient id="heartGradient" x1="0%" y1="0%" x2="100%" y2="100%">
+      <stop offset="0%" style="stop-color:#ff6b9d;stop-opacity:1" />
+      <stop offset="50%" style="stop-color:#e34d59;stop-opacity:1" />
+      <stop offset="100%" style="stop-color:#c9184a;stop-opacity:1" />
+    </linearGradient>
+  </defs>
+  <!-- 主体爱心 -->
+  <path d="M24 42L20.55 38.85C11.4 30.48 5.25 24.87 5.25 18C5.25 12.39 9.39 8.25 15 8.25C18.09 8.25 21.06 9.69 23.25 12C25.44 9.69 28.41 8.25 31.5 8.25C37.11 8.25 41.25 12.39 41.25 18C41.25 24.87 35.1 30.48 25.95 38.85L24 42Z" fill="url(#heartGradient)" filter="url(#glow)"/>
+  <!-- 高光 -->
+  <path d="M15 8.25C12.5 8.25 10.3 9.2 8.8 10.8C10.5 9.5 12.6 8.8 15 8.8C17.5 8.8 19.8 9.8 21.5 11.5C20 9.5 17.7 8.25 15 8.25Z" fill="white" opacity="0.4"/>
+</svg>