refactor(videocall): migrate to @riverpod controller pattern and add device config

- Rename ViewModel → Controller, ViewState → State with @riverpod codegen
- Move state/ → providers/ folder for consistency
- Add post-init device configuration (camera, speaker, maxCallNum, mediaConfig)
- Use MediaConfig.generateByMode based on device capabilities.system (rtos/android)
- Add CallParam.ticket for smartwatch wake-up protocol
- Start audio/camera before call, stop on hangup
- Granular video management based on uploadVideoStreamSelf/Other flags
- Build watch userId from device.imei (w_ prefix)
- Add imei field to DeviceEntity
- Add system field to DeviceCapabilitiesEntity with isRtos/isAndroid helpers

packages/videocall_sdk/lib/src/models/videocall_item.dart

@@ -7,24 +7,34 @@ class VideocallItem {
     required this.isVideo,
     required this.direction,
     required this.state,
+    this.uploadVideoStreamSelf = false,
+    this.uploadVideoStreamOther = false,
   });
 
   final String userId;
   final bool isVideo;
   final CallDirection direction;
   final VideocallState state;
+  final bool uploadVideoStreamSelf;
+  final bool uploadVideoStreamOther;
 
   VideocallItem copyWith({
     String? userId,
     bool? isVideo,
     CallDirection? direction,
     VideocallState? state,
+    bool? uploadVideoStreamSelf,
+    bool? uploadVideoStreamOther,
   }) {
     return VideocallItem(
       userId: userId ?? this.userId,
       isVideo: isVideo ?? this.isVideo,
       direction: direction ?? this.direction,
       state: state ?? this.state,
+      uploadVideoStreamSelf:
+          uploadVideoStreamSelf ?? this.uploadVideoStreamSelf,
+      uploadVideoStreamOther:
+          uploadVideoStreamOther ?? this.uploadVideoStreamOther,
     );
   }
 }

packages/videocall_sdk/lib/src/services/videocall_call_service.dart

@@ -265,6 +265,8 @@ class VideocallCallService with JCCallCallback {
           ? CallDirection.incoming
           : CallDirection.outgoing,
       state: state,
+      uploadVideoStreamSelf: item.uploadVideoStreamSelf,
+      uploadVideoStreamOther: item.uploadVideoStreamOther,
     );
   }