feat(channel): add tonggan bridge and identity migration plan

tonggan-bridge/templates/BRIDGE-RECORD.template.json

@@ -0,0 +1,20 @@
+{
+  "schema": "guanghu.tonggan-bridge-record/v1",
+  "bridge_id": "TGB-YYYYMMDD-001",
+  "state": "AWAITING_OWNER_DEPLOYMENT_CONFIRMATION",
+  "module": { "name": "", "why_server_deployment_is_required": "" },
+  "binding": {
+    "repo": "bingshuo/guanghu-ice-heart",
+    "branch": "main",
+    "commit_sha": "40 lowercase hex",
+    "target": "JD-FD-PRIMARY",
+    "resource": "REQUEST-ID@same-40-lowercase-hex",
+    "manifest": "deployment/requests/REQUEST-ID.json"
+  },
+  "paths": {
+    "reasoning_path": "tonggan-bridge/reasoning/TGB-YYYYMMDD-001.hdlp",
+    "workorder_path": "tonggan-bridge/workorders/TGB-YYYYMMDD-001.json",
+    "receipt_path": "tonggan-bridge/receipts/TGB-YYYYMMDD-001.json"
+  },
+  "security": { "no_secrets": true, "explicit_second_signal_required": true }
+}