feat: 后端全量更新 - 含所有本次需求

- Contract.php: 返回合约账户余额(balance_contract)
- My.php: 地址管理增加BTC/ETH
- AppContract.php: 一键平仓(closeall)
- AppProxy.php: 代理专属注册链接 + 分级权限(L1/L2)
- site.php: 手续费减半(0.018→0.009)
- agent_permission_setup.sql: 代理权限SQL
- crypto_news_crawler.py: 新闻自动采集脚本

application/admin/command/Crud/stubs/html/checkbox.stub

@@ -0,0 +1,6 @@
+
+            <div class="checkbox">
+            {foreach name="{%fieldList%}" item="vo"}
+            <label for="{%fieldName%}-{$key}"><input id="{%fieldName%}-{$key}" name="{%fieldName%}" type="checkbox" value="{$key}" {in name="key" value="{%selectedValue%}"}checked{/in} /> {$vo}</label> 
+            {/foreach}
+            </div>

application/admin/command/Crud/stubs/html/fieldlist.stub

@@ -0,0 +1,10 @@
+
+            <dl class="fieldlist" data-name="{%fieldName%}">
+                <dd>
+                    <ins>{:__('{%itemKey%}')}</ins>
+                    <ins>{:__('{%itemValue%}')}</ins>
+                </dd>
+                <dd><a href="javascript:;" class="btn btn-sm btn-success btn-append"><i class="fa fa-plus"></i> {:__('Append')}</a></dd>
+                <textarea name="{%fieldName%}" class="form-control hide" cols="30" rows="5">{%fieldValue%}</textarea>
+            </dl>
+

application/admin/command/Crud/stubs/html/heading-html.stub

@@ -0,0 +1,10 @@
+
+    <div class="panel-heading">
+        {:build_heading(null,FALSE)}
+        <ul class="nav nav-tabs" data-field="{%field%}">
+            <li class="{:$Think.get.{%field%} === null ? 'active' : ''}"><a href="#t-all" data-value="" data-toggle="tab">{:__('All')}</a></li>
+            {foreach name="{%fieldName%}List" item="vo"}
+            <li class="{:$Think.get.{%field%} === (string)$key ? 'active' : ''}"><a href="#t-{$key}" data-value="{$key}" data-toggle="tab">{$vo}</a></li>
+            {/foreach}
+        </ul>
+    </div>

application/admin/command/Crud/stubs/html/radio.stub

@@ -0,0 +1,6 @@
+
+            <div class="radio">
+            {foreach name="{%fieldList%}" item="vo"}
+            <label for="{%fieldName%}-{$key}"><input id="{%fieldName%}-{$key}" name="{%fieldName%}" type="radio" value="{$key}" {in name="key" value="{%selectedValue%}"}checked{/in} /> {$vo}</label> 
+            {/foreach}
+            </div>

application/admin/command/Crud/stubs/html/recyclebin-html.stub

@@ -0,0 +1 @@
+<a class="btn btn-success btn-recyclebin btn-dialog {:$auth->check('{%controllerUrl%}/recyclebin')?'':'hide'}" href="{%controllerUrl%}/recyclebin" title="{:__('Recycle bin')}"><i class="fa fa-recycle"></i> {:__('Recycle bin')}</a>

application/admin/command/Crud/stubs/html/select.stub

@@ -0,0 +1,6 @@
+            
+            <select {%attrStr%}>
+                {foreach name="{%fieldList%}" item="vo"}
+                    <option value="{$key}" {in name="key" value="{%selectedValue%}"}selected{/in}>{$vo}</option>
+                {/foreach}
+            </select>

application/admin/command/Crud/stubs/html/switch.stub

@@ -0,0 +1,5 @@
+
+            <input {%attrStr%} name="{%fieldName%}" type="hidden" value="{%fieldValue%}">
+            <a href="javascript:;" data-toggle="switcher" class="btn-switcher" data-input-id="c-{%field%}" data-yes="{%fieldYes%}" data-no="{%fieldNo%}" >
+                <i class="fa fa-toggle-on text-success {%fieldSwitchClass%} fa-2x"></i>
+            </a>