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

public/assets/libs/Sortable/.bower.json

@@ -0,0 +1,40 @@
+{
+  "name": "Sortable",
+  "main": [
+    "Sortable.js"
+  ],
+  "homepage": "http://SortableJS.github.io/Sortable/",
+  "authors": [
+    "RubaXa <ibnRubaXa@gmail.com>",
+    "owenm <owen23355@gmail.com>"
+  ],
+  "description": "JavaScript library for reorderable drag-and-drop lists on modern browsers and touch devices. No jQuery required. Supports Meteor, AngularJS, React, Polymer, Vue, Knockout and any CSS library, e.g. Bootstrap.",
+  "keywords": [
+    "sortable",
+    "reorder",
+    "list",
+    "html5",
+    "drag",
+    "and",
+    "drop",
+    "dnd",
+    "web-components"
+  ],
+  "license": "MIT",
+  "ignore": [
+    "node_modules",
+    "bower_components",
+    "test",
+    "tests"
+  ],
+  "version": "1.10.2",
+  "_release": "1.10.2",
+  "_resolution": {
+    "type": "version",
+    "tag": "1.10.2",
+    "commit": "2addddd67387b6e4b6b5e51806eb698f0a3eee88"
+  },
+  "_source": "https://github.com/RubaXa/Sortable.git",
+  "_target": "~1.10.0",
+  "_originalSource": "Sortable"
+}