Phase 1.14.b：LaunchScreen 替换为启动图（SplashImage）

- 将 docs/res/Res/Default-568h@2x~iphone.png（msext 时代竖图 640×1136
  CgBI 压缩，29708 字节）拷入 ylgamehall/Assets.xcassets/SplashImage.imageset/，
  Contents.json 声明 universal idiom @1x/@2x/@3x（仅 @2x 提供物理文件）
- 改写 LaunchScreen.storyboard：黑底 + 单个 UIImageView（image="SplashImage"，
  contentMode=scaleAspectFill），四边约束到 superview 完成全屏铺满
- 启动瞬间用户看到的是启动图而非黑屏；竖图在横屏设备上会被 aspectFill
  上下裁剪，启动只展示 0.x s，接受此折衷，Phase 10 polish 时再考虑做
  专门的横屏素材
- BuildProject 通过（55s）

Plan 进度已勾选（§5 Phase 1.14.b + §8）

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

ylgamehall/Assets.xcassets/SplashImage.imageset/Contents.json

@@ -0,0 +1,21 @@
+{
+  "images" : [
+    {
+      "idiom" : "universal",
+      "scale" : "1x"
+    },
+    {
+      "filename" : "SplashImage@2x.png",
+      "idiom" : "universal",
+      "scale" : "2x"
+    },
+    {
+      "idiom" : "universal",
+      "scale" : "3x"
+    }
+  ],
+  "info" : {
+    "author" : "xcode",
+    "version" : 1
+  }
+}

ylgamehall/Base.lproj/LaunchScreen.storyboard

@@ -1,19 +1,31 @@
-<?xml version="1.0" encoding="UTF-8" standalone="no"?>
-<document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="13122.16" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" launchScreen="YES" useTraitCollections="YES" useSafeAreas="YES" colorMatched="YES" initialViewController="01J-lp-oVM">
+<?xml version="1.0" encoding="UTF-8"?>
+<document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="22155" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" launchScreen="YES" useTraitCollections="YES" useSafeAreas="YES" colorMatched="YES" initialViewController="01J-lp-oVM">
+    <device id="retina6_12" orientation="landscape" appearance="light"/>
     <dependencies>
-        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="13104.12"/>
+        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="22131"/>
         <capability name="Safe area layout guides" minToolsVersion="9.0"/>
         <capability name="documents saved in the Xcode 8 format" minToolsVersion="8.0"/>
     </dependencies>
     <scenes>
-        <!--View Controller-->
+        <!--Splash View Controller-->
         <scene sceneID="EHf-IW-A2E">
             <objects>
                 <viewController id="01J-lp-oVM" sceneMemberID="viewController">
                     <view key="view" contentMode="scaleToFill" id="Ze5-6b-2t3">
-                        <rect key="frame" x="0.0" y="0.0" width="375" height="667"/>
+                        <rect key="frame" x="0.0" y="0.0" width="852" height="393"/>
                         <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
-                        <color key="backgroundColor" xcode11CocoaTouchSystemColor="systemBackgroundColor" cocoaTouchSystemColor="whiteColor"/>
+                        <subviews>
+                            <imageView clipsSubviews="YES" userInteractionEnabled="NO" contentMode="scaleAspectFill" image="SplashImage" translatesAutoresizingMaskIntoConstraints="NO" id="ImgV-Sp-1ab">
+                                <rect key="frame" x="0.0" y="0.0" width="852" height="393"/>
+                            </imageView>
+                        </subviews>
+                        <color key="backgroundColor" red="0.0" green="0.0" blue="0.0" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
+                        <constraints>
+                            <constraint firstAttribute="trailing" secondItem="ImgV-Sp-1ab" secondAttribute="trailing" id="cst-tr-001"/>
+                            <constraint firstItem="ImgV-Sp-1ab" firstAttribute="leading" secondItem="Ze5-6b-2t3" secondAttribute="leading" id="cst-ld-002"/>
+                            <constraint firstItem="ImgV-Sp-1ab" firstAttribute="top" secondItem="Ze5-6b-2t3" secondAttribute="top" id="cst-tp-003"/>
+                            <constraint firstAttribute="bottom" secondItem="ImgV-Sp-1ab" secondAttribute="bottom" id="cst-bt-004"/>
+                        </constraints>
                         <viewLayoutGuide key="safeArea" id="6Tk-OE-BBY"/>
                     </view>
                 </viewController>
@@ -22,4 +34,7 @@
             <point key="canvasLocation" x="53" y="375"/>
         </scene>
     </scenes>
+    <resources>
+        <image name="SplashImage" width="640" height="1136"/>
+    </resources>
 </document>