Document cloud account binding (§17): deviceBindV2 + token signature

docs/RE_DART_FINDINGS.md

@@ -396,6 +396,34 @@ Library: `power.get_power()` tries detail → load → EMS in order
 (`franklinwh_agate_client/power.py`); `LocalDeviceClient` gained
 `query_detail_info()` / `query_load_status()`.
 
+## 17. Cloud account binding (installer flow)
+
+Binding a unit to an account is an *installer commissioning* action, not
+a local-socket one (`sections/installer/bind_device/`):
+
+- `BindDeviceProvider.bind()` POSTs a data map to
+  **`RemoteInterface.deviceBind` → `POST {cloud}/manage/deviceBindV2`**,
+  with `protocolVer: "V1.10.01"`, the installer `jobCode`, the
+  `commissionId` (preset-site path via `InstallContext`), and the
+  `BindDeviceEntity` payload. Result parses as
+  `HttpResultEntity<BindDeviceEntity>` (bound `account`, distributor /
+  financier ids/names).
+- Mirror calls: `queryDeviceBindData` →
+  `GET {cloud}​/manage/getGatewayBindData` (pre-check: is this gateway
+  already bound, to whom) and `deviceUnbind` →
+  `POST {cloud}​/manage/unBindDevice` ("Are you sure you want to
+  unbind?", `unbindSuccess` strings).
+- Request auth on cloud calls is a signature, not a session cookie:
+  `RemoteService` computes **`MD5(jsonEncode(body) + "B6F3Zu&aW8XlH9CA")`**
+  and sends it as the **`token`** header (dio `Options`). User login
+  itself is Okta (`sunrun.okta.com`, MFA endpoints); the known cloud
+  bases are `https://e-api.franklinwh.com/api/appapi` and
+  `https://energy.franklinwh.com/*` (exact `/manage` base mapping lives
+  in the `RemoteService` dio init).
+- Locally, bound devices land in the trusted-devices table
+  (`DatabaseManager.getTrustedDevicesTableList`, consulted by
+  `_checkConnectedNotTrustedAp` on direct-connect).
+
 ## 9. Bluetooth (BLE) transport — `communication_center/bluetooth`
 
 - `BluetoothManager` (singleton), `BluetoothStatus`: `closed / connected / connecting / interrupted`.