feat: FamilyRelationGraph 新增齿轮跳转成员管理、悬停/点击+号进入添加成员页、高度自适应

Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-openagent)

Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>

cfc-frontend/components/FamilyRelationGraph.vue

@@ -1,6 +1,10 @@
 <template>
   <!-- 全 Canvas 关系图谱 - Force-directed 物理布局 -->
   <view class="family-graph-wrapper" v-if="simNodes && simNodes.length >= 1">
+    <!-- 右上角小齿轮 -->
+    <view class="gear-icon" @click="onManageTap">
+      <text class="gear-text">⚙</text>
+    </view>
     <canvas
       class="family-graph-canvas"
       canvas-id="forceGraphCanvas"
@@ -9,7 +13,19 @@
       :style="{ width: canvasWidth + 'px', height: canvasHeight + 'px' }"
       @touchstart="onTouchStart"
       @touchmove="onTouchMove"
-      @touchend="onTouchEnd" />
+      @touchend="onTouchEnd"
+      @click="onCanvasClick" />
+    <!-- PC 端悬停检测层 -->
+    <view
+      v-if="isPC"
+      class="hover-layer"
+      :style="{ width: canvasWidth + 'px', height: canvasHeight + 'px' }"
+      @mousemove="onHoverMove"
+      @mouseleave="onHoverLeave" />
+    <!-- + 添加成员提示（触摸/悬停时显示在中心节点旁） -->
+    <view class="add-hint" :class="{ 'add-hint-visible': touchingSelf || hoveringSelf }" :style="addHintPosition">
+      <text class="add-hint-text">+</text>
+    </view>
   </view>
   <!-- 空状态 -->
   <view class="family-graph-empty" v-else-if="members && members.length === 0">
@@ -93,6 +109,13 @@ export default {
       animFrameId: null,
       isSimulating: false,
 
+      // 触摸/悬停状态（显示 + 号）
+      touchingSelf: false,
+      hoveringSelf: false,
+
+      // 是否 PC 环境（h5 编译）
+      isPC: false,
+
       // 主题色
       themeColors: {
         body: '#8D6E63',
@@ -108,6 +131,16 @@ export default {
       return this.themeColors[this.dimensionCode] || '#8D6E63'
     },
 
+    // + 提示位置（跟随中心节点偏移）
+    addHintPosition: function() {
+      var selfNode = this.simNodes.find(function(n) { return n.isSelf })
+      if (!selfNode) return {}
+      return {
+        left: (selfNode.x + selfNode.radius * 0.7) + 'px',
+        top: (selfNode.y - selfNode.radius * 0.5) + 'px'
+      }
+    },
+
     // 将 members 转换为 simNodes
     nodeData: function() {
       var self = this