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/font-awesome/.npmignore

@@ -0,0 +1,42 @@
+*.pyc
+*.egg-info
+*.db
+*.db.old
+*.swp
+*.db-journal
+
+.coverage
+.DS_Store
+.installed.cfg
+_gh_pages/*
+
+.idea/*
+.svn/*
+src/website/static/*
+src/website/media/*
+
+bin
+cfcache
+develop-eggs
+dist
+downloads
+eggs
+parts
+tmp
+.sass-cache
+node_modules
+
+src/website/settingslocal.py
+stunnel.log
+
+.ruby-version
+
+# don't need these in the npm package.
+src/
+_config.yml
+bower.json
+component.json
+composer.json
+CONTRIBUTING.md
+Gemfile
+Gemfile.lock