feat(flutter): 强化开屏品牌标识展示

lib/pages/splash/splash_page.dart

@@ -8,8 +8,8 @@ import 'package:flutter/services.dart';
 import '../../core/theme/app_colors.dart';
 
 const Color _splashBackground = Color(0xFF100C0A);
-const Color _markGlow = Color(0x33FF7A1A);
-const double _markSize = 96;
+const Color _markGlow = Color(0x40FF7A1A);
+const double _markSize = 112;
 const double _markRadius = 24;
 const double _logoGlowSize = 144;
 const double _logoGlowBlur = 40;
@@ -130,6 +130,7 @@ class _SplashPageState extends State<SplashPage>
             alignment: Alignment.center,
             children: [
               ImageFiltered(
+                key: const Key('splash-logo-glow'),
                 imageFilter: ImageFilter.blur(
                   sigmaX: _logoGlowBlur,
                   sigmaY: _logoGlowBlur,
@@ -149,6 +150,7 @@ class _SplashPageState extends State<SplashPage>
                 borderRadius: BorderRadius.circular(_markRadius),
                 child: Image.asset(
                   _markAsset,
+                  key: const Key('splash-logo-mark'),
                   width: _markSize,
                   height: _markSize,
                   filterQuality: FilterQuality.medium,