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/_archived/ai-robot-title.svg

@@ -0,0 +1,16 @@
+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" width="24" height="24" fill="none">
+  <!-- AI 机器人 title badge icon — indigo 配色，用于标题徽章 -->
+  <!-- 对齐 H5 ai-icons.css .ai-title-badge-icon, 默认 indigo: #667eea → #a78bfa -->
+  <rect x="5" y="7" width="14" height="12" rx="4" fill="white" stroke="currentColor" stroke-width="0.8"/>
+  <path d="M12 7V4" stroke="currentColor" stroke-width="1.5" stroke-linecap="round"/>
+  <circle cx="12" cy="3" r="1.5" fill="white" stroke="currentColor" stroke-width="0.7"/>
+  <circle cx="9" cy="11.5" r="2" fill="#667eea"/>
+  <circle cx="15" cy="11.5" r="2" fill="#667eea"/>
+  <circle cx="9.5" cy="11" r="0.7" fill="white"/>
+  <circle cx="15.5" cy="11" r="0.7" fill="white"/>
+  <path d="M9.5 15C10 16 14 16 14.5 15" stroke="#667eea" stroke-width="1.5" stroke-linecap="round"/>
+  <circle cx="7" cy="13.5" r="1" fill="#f5a0c0" opacity="0.6"/>
+  <circle cx="17" cy="13.5" r="1" fill="#f5a0c0" opacity="0.6"/>
+  <rect x="3" y="10" width="2" height="4" rx="1" fill="white" stroke="currentColor" stroke-width="0.7"/>
+  <rect x="19" y="10" width="2" height="4" rx="1" fill="white" stroke="currentColor" stroke-width="0.7"/>
+</svg>