feat: implement MVP Phase 1 — full-area scan with ADC data collection

- Send scan command: all 5 regions LED on, brightness 128
- Listen for ADC notify (17 bytes) instead of broken queryStatus
- Parse and display PD1-PD7 values with visual bars
- Show VBAT/battery info
- Store scan PD data in globalData for Phase 3 smart adjustment
- 8s timeout fallback, stop LED on page unload

miniprogram/pages/auto-scan/auto-scan.wxss

@@ -1,13 +1,13 @@
 .scan-container {
-  position: relative;
-  width: 320rpx;
-  height: 400rpx;
-  margin: 40rpx auto;
+  display: flex;
+  flex-direction: column;
+  align-items: center;
+  padding: 20rpx 0;
 }
 
 .face-outline {
-  width: 100%;
-  height: 100%;
+  width: 320rpx;
+  height: 400rpx;
   border: 6rpx solid #e5e5e5;
   border-radius: 50% 50% 45% 45%;
   position: relative;
@@ -29,49 +29,103 @@
   100% { top: calc(100% - 6rpx); opacity: 0.5; }
 }
 
-.scan-hint {
-  text-align: center;
-  font-size: 26rpx;
-  color: #666666;
-  margin-bottom: 24rpx;
+.scan-progress-bar {
+  width: 80%;
+  height: 8rpx;
+  background: #f0f0f0;
+  border-radius: 4rpx;
+  margin-top: 30rpx;
+  overflow: hidden;
 }
 
-.scan-progress {
-  text-align: center;
-  background: #f0f9ff;
-  padding: 16rpx 28rpx;
-  border-radius: 24rpx;
-  font-size: 26rpx;
-  color: #006699;
-  width: fit-content;
-  margin: 0 auto;
+.scan-progress-fill {
+  height: 100%;
+  background: linear-gradient(90deg, #E6508C, #DCB982);
+  border-radius: 4rpx;
+  transition: width 0.3s;
 }
 
-.highlight {
-  color: #E6508C;
-  font-weight: 600;
-}
-
-.detected-tags {
-  text-align: center;
-  margin-top: 24rpx;
-}
-
-.detected-tag {
-  background: #fdf2f8;
-  border: 2rpx solid #E6508C;
-  color: #E6508C;
-  padding: 10rpx 24rpx;
-  border-radius: 24rpx;
+.scan-status {
   font-size: 24rpx;
-  display: inline-block;
-  margin: 6rpx;
-  animation: tagPulse 1s ease-in-out;
+  color: #999;
+  margin-top: 16rpx;
+  text-align: center;
 }
 
-@keyframes tagPulse {
-  0%, 100% { transform: scale(1); }
-  50% { transform: scale(1.05); }
+.scan-result {
+  background: #fff;
+  border-radius: 20rpx;
+  padding: 24rpx;
+  margin-top: 20rpx;
+}
+
+.result-title {
+  font-size: 28rpx;
+  font-weight: 600;
+  color: #333;
+  margin-bottom: 20rpx;
+}
+
+.pd-list {
+  display: flex;
+  flex-direction: column;
+  gap: 16rpx;
+}
+
+.pd-item {
+  display: flex;
+  align-items: center;
+  gap: 16rpx;
+}
+
+.pd-region {
+  font-size: 26rpx;
+  color: #666;
+  width: 160rpx;
+  flex-shrink: 0;
+}
+
+.pd-value {
+  font-size: 28rpx;
+  font-weight: 600;
+  color: #E6508C;
+  width: 100rpx;
+  flex-shrink: 0;
+  text-align: right;
+}
+
+.pd-empty {
+  color: #ccc;
+  font-weight: normal;
+}
+
+.pd-bar-bg {
+  flex: 1;
+  height: 16rpx;
+  background: #f5f5f5;
+  border-radius: 8rpx;
+  overflow: hidden;
+}
+
+.pd-bar-fill {
+  height: 100%;
+  background: linear-gradient(90deg, #E6508C, #DCB982);
+  border-radius: 8rpx;
+  min-width: 4rpx;
+}
+
+.vbat-info {
+  margin-top: 20rpx;
+  font-size: 24rpx;
+  color: #999;
+  text-align: center;
+}
+
+.scan-error {
+  text-align: center;
+  color: #ff4d4f;
+  font-size: 26rpx;
+  margin-top: 20rpx;
 }
 
 .btn-primary::after {