use zanui name

packages/zanui/src/button.pcss

@@ -1,6 +1,6 @@
 @import "./common/var.pcss";
 
-@component-namespace o2 {
+@component-namespace z {
   @component button {
     position: relative;
     display: block;

packages/zanui/src/cell.pcss

@@ -1,7 +1,7 @@
 @import "./common/var.pcss";
 @import "./mixins/border_retina.pcss";
 
-@component-namespace o2 {
+@component-namespace z {
   @component cell-group {
     padding-left: 10px;
     position: relative;

packages/zanui/src/dialog.pcss

@@ -1,6 +1,6 @@
 @import "./mixins/border_retina.pcss";
 
-@component-namespace o2 {
+@component-namespace z {
   @component dialog-wrapper {
     position: absolute;
   }
@@ -53,11 +53,11 @@
     }
 
     .is-twobtn {
-      .o2-dialog-btn {
+      .z-dialog-btn {
         width: 50%;
       }
 
-      .o2-dialog-cancel {
+      .z-dialog-cancel {
         &::after {
           @mixin border-retina (right);
         }

packages/zanui/src/field.pcss

@@ -1,42 +1,42 @@
 @import "./common/var.pcss";
 @import "./mixins/border_retina.pcss";
 
-@component-namespace o2 {
+@component-namespace z {
   @component field {
     width: 100%;
     overflow: hidden;
 
     @when textarea {
-      .o2-field-control {
+      .z-field-control {
         min-height: 60px;
       }
     }
 
     @when nolabel {
-      .o2-cell-title {
+      .z-cell-title {
         display: none;
       }
 
-      .o2-cell-value {
+      .z-cell-value {
         width: 100%;
         padding-left: 0;
       }
     }
 
-    .o2-cell-title,
-    .o2-cell-value {
+    .z-cell-title,
+    .z-cell-value {
       float: none;
       box-sizing: border-box;
     }
 
-    .o2-cell-title {
+    .z-cell-title {
       width: 90px;
       position: absolute;
       top: 10px;
       left: 0;
     }
 
-    .o2-cell-value {
+    .z-cell-value {
       width: 100%;
       padding-left: 90px;
     }

packages/zanui/src/popup.pcss

@@ -7,7 +7,7 @@
   background-color: rgba(0, 0, 0, 0.701961);
 }
 
-@component-namespace o2 {
+@component-namespace z {
   @component popup {
     position: fixed;
     background-color: #fff;

packages/zanui/src/switch.pcss

@@ -1,4 +1,4 @@
-@component-namespace o2 {
+@component-namespace z {
   @component switch { 
     height: 29px;
     width: 49px;