refactor(core): 平台上报收敛为单个请求头

去掉 device_info_plus 依赖与机型/系统版本，只保留 X-Client-Platform。

pubspec.lock

@@ -113,22 +113,6 @@ packages:
       url: "https://pub.flutter-io.cn"
     source: hosted
     version: "1.0.9"
-  device_info_plus:
-    dependency: "direct main"
-    description:
-      name: device_info_plus
-      sha256: "86add5ef97215562d2e090535b0a16f197902b10c369c558a100e74ea06e8659"
-      url: "https://pub.flutter-io.cn"
-    source: hosted
-    version: "9.0.3"
-  device_info_plus_platform_interface:
-    dependency: transitive
-    description:
-      name: device_info_plus_platform_interface
-      sha256: e1ea89119e34903dca74b883d0dd78eb762814f97fb6c76f35e9ff74d261a18f
-      url: "https://pub.flutter-io.cn"
-    source: hosted
-    version: "7.0.3"
   dio:
     dependency: "direct main"
     description:
@@ -721,22 +705,6 @@ packages:
       url: "https://pub.flutter-io.cn"
     source: hosted
     version: "3.2.0"
-  win32:
-    dependency: transitive
-    description:
-      name: win32
-      sha256: d7cb55e04cd34096cd3a79b3330245f54cb96a370a1c27adb3c84b917de8b08e
-      url: "https://pub.flutter-io.cn"
-    source: hosted
-    version: "5.15.0"
-  win32_registry:
-    dependency: transitive
-    description:
-      name: win32_registry
-      sha256: "21ec76dfc731550fd3e2ce7a33a9ea90b828fdf19a5c3bcf556fa992cfa99852"
-      url: "https://pub.flutter-io.cn"
-    source: hosted
-    version: "1.1.5"
   xdg_directories:
     dependency: transitive
     description: