fix(mp): 行业标准第二轮审计修复 — 安全存储+UX+合规

- 安全：AI聊天历史、患者档案、设备同步数据统一走 secureSet/secureGet 加密存储
- 合规：TabBar "消息" 改为 "助手" 消除命名误导
- 合规：新增 .env.production 模板配置 HTTPS API URL
- UX：AI发送按钮 40→44px、反馈按钮 32→44px、协议勾选框 44px 点击热区
- UX：5处硬编码 10-12px 字号替换为 design token（DoctorTabBar/ShortcutButton/TodoAlert/mall）
- UX：6处安全区域写法统一（全部使用 --tk-page-padding/--tk-tabbar-space + env fallback）
- 新增 safe-bottom-padded / safe-bottom-tabbar 两个 mixin

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

apps/miniprogram/src/pages/appointment/create/index.scss

@@ -308,7 +308,7 @@
   gap: var(--tk-gap-md);
   padding: var(--tk-section-gap) var(--tk-gap-lg);
   padding-bottom: constant(safe-area-inset-bottom);
-  padding-bottom: env(safe-area-inset-bottom);
+  padding-bottom: calc(var(--tk-page-padding) + env(safe-area-inset-bottom, 0px));
   background: $card;
   box-shadow: $shadow-md;
 }

apps/miniprogram/src/pages/appointment/detail/index.scss

@@ -153,7 +153,7 @@
   right: 0;
   padding: var(--tk-section-gap) var(--tk-gap-lg);
   padding-bottom: constant(safe-area-inset-bottom);
-  padding-bottom: env(safe-area-inset-bottom);
+  padding-bottom: calc(var(--tk-page-padding) + env(safe-area-inset-bottom, 0px));
   background: $card;
   box-shadow: $shadow-md;
 }

apps/miniprogram/src/pages/health/index.scss

@@ -341,7 +341,8 @@
 }
 
 .ai-feedback-btn {
-  height: 32px;
+  height: 44px;
+  min-height: 44px;
   border-radius: $r-xs;
   @include flex-center;
   padding: 0 var(--tk-gap-sm);

apps/miniprogram/src/pages/login/index.scss

@@ -189,6 +189,17 @@
   @include flex-center;
   flex-shrink: 0;
   margin-top: 1px;
+  position: relative;
+
+  // 扩大点击区域至 44x44（24px 视觉 + 10px 每侧 padding via 伪元素）
+  &::before {
+    content: '';
+    position: absolute;
+    top: -10px;
+    right: -10px;
+    bottom: -10px;
+    left: -10px;
+  }
 
   &.checked {
     background: var(--tk-pri);

apps/miniprogram/src/pages/mall/index.scss

@@ -308,7 +308,7 @@
   position: absolute;
   top: 8px;
   left: 8px;
-  font-size: 10px;
+  font-size: var(--tk-font-micro);
   font-weight: 600;
   padding: 2px 8px;
   border-radius: 6px;

apps/miniprogram/src/pages/messages/index.scss

@@ -252,7 +252,7 @@
   align-items: center;
   gap: 10px;
   padding: 10px 16px;
-  padding-bottom: calc(10px + env(safe-area-inset-bottom));
+  padding-bottom: calc(var(--tk-tabbar-space) + env(safe-area-inset-bottom, 0px));
   background: $card;
   border-top: 1px solid $bd-l;
   flex-shrink: 0;
@@ -275,9 +275,9 @@
 }
 
 .ai-chat-bar__send {
-  width: 40px;
-  height: 40px;
-  border-radius: 20px;
+  width: 44px;
+  height: 44px;
+  border-radius: 22px;
   background: $pri;
   display: flex;
   align-items: center;

apps/miniprogram/src/pages/pkg-consultation/detail/index.scss

@@ -197,7 +197,7 @@
   align-items: center;
   gap: 10px;
   padding: 10px 16px;
-  padding-bottom: calc(10px + env(safe-area-inset-bottom));
+  padding-bottom: calc(var(--tk-page-padding) + env(safe-area-inset-bottom, 0px));
   background: $card;
   border-top: 1px solid $bd-l;
   flex-shrink: 0;

apps/miniprogram/src/pages/pkg-doctor-core/consultation/detail/index.scss

@@ -117,7 +117,7 @@
   padding: var(--tk-gap-md) var(--tk-gap-lg);
   background: $card;
   border-top: 1px solid $bd;
-  padding-bottom: calc(16px + env(safe-area-inset-bottom));
+  padding-bottom: calc(var(--tk-page-padding) + env(safe-area-inset-bottom, 0px));
 }
 
 .chat-input {

apps/miniprogram/src/pages/pkg-mall/orders/index.scss

@@ -4,7 +4,7 @@
 // 订单列表 — 对齐原型 docs/design/mp-10-mall-pkg.html → 屏幕3
 
 .orders-page {
-  padding-bottom: env(safe-area-inset-bottom);
+  padding-bottom: calc(var(--tk-page-padding) + env(safe-area-inset-bottom, 0px));
 }
 
 // 状态筛选 Tab