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-sm.svg

@@ -0,0 +1,13 @@
+<svg width="24" height="24" viewBox="0 0 24 24" fill="none" xmlns="http://www.w3.org/2000/svg">
+  <!-- 白色填充版机器人（用于 ai-inline-icon 渐变背景上） -->
+  <rect x="5" y="7" width="14" height="12" rx="4" fill="white"/>
+  <path d="M12 7V4" stroke="white" stroke-width="2" stroke-linecap="round"/>
+  <circle cx="12" cy="3" r="1.5" fill="white"/>
+  <circle cx="9" cy="11.5" r="2" fill="white" opacity="0.5"/>
+  <circle cx="15" cy="11.5" r="2" fill="white" opacity="0.5"/>
+  <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="white" stroke-width="1.5" stroke-linecap="round" opacity="0.7"/>
+  <rect x="3" y="10" width="2" height="4" rx="1" fill="white"/>
+  <rect x="19" y="10" width="2" height="4" rx="1" fill="white"/>
+</svg>