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/GoJS-master/projects/bpmn/BPMNdata/BasicOrderProcess.json

@@ -0,0 +1,21 @@
+        { "class": "go.GraphLinksModel",
+          "linkFromPortIdProperty": "fromPort",
+          "linkToPortIdProperty": "toPort",
+          "modelData": {"position":"230 200"},
+          "nodeDataArray": [
+        {"category":"event", "item":"start", "key":101, "loc":"450 540", "text":"Start", "eventType":1, "eventDimension":1},
+        {"category":"event", "item":"End", "key":104, "loc":"1130 540", "text":"End", "eventType":1, "eventDimension":8},
+        {"category":"activity", "item":"generic task", "key":5, "loc":"1010 540", "text":"Send Invoice", "taskType":0, "boundaryEventArray":[  ]},
+        {"category":"activity", "item":"generic task", "key":-4, "loc":"860 540", "text":"Fulfill Order", "taskType":0, "boundaryEventArray":[  ]},
+        {"category":"activity", "item":"generic task", "key":-5, "loc":"710 540", "text":"Credit Check", "taskType":0, "boundaryEventArray":[  ]},
+        {"category":"activity", "item":"generic task", "key":-6, "loc":"560 540", "text":"Receive Order", "taskType":0, "boundaryEventArray":[  ]},
+        {"category":"annotation", "key":701, "loc":"494 434", "text":"Basic Order Process"}
+          
+        ],
+          "linkDataArray": [
+        {"from":101, "to":-6, "fromPort":"", "toPort":""},
+        {"from":-6, "to":-5, "fromPort":"", "toPort":""},
+        {"from":-5, "to":-4, "fromPort":"", "toPort":""},
+        {"from":-4, "to":5, "fromPort":"", "toPort":""},
+        {"from":5, "to":104, "fromPort":"", "toPort":""}
+        ]}