feat(MOB): 앱 아이콘 교체, Release 서명 설정 및 버전 0.1 시작

- 앱 아이콘을 SAM 로고(blue.png)로 전체 교체 (15개 파일)
- Release keystore 서명 설정 추가 (build.gradle)
- versionName 0.1로 변경 (개발 배포용)
- .gitignore에 keystore 파일 제외 추가

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

android/.gitignore

@@ -53,9 +53,9 @@ captures/
 .idea/navEditor.xml
 
 # Keystore files
-# Uncomment the following lines if you do not want to check your keystore files in.
-#*.jks
-#*.keystore
+*.jks
+*.keystore
+keystore/
 
 # External native build folder generated in Android Studio 2.2 and later
 .externalNativeBuild

android/app/build.gradle

@@ -3,12 +3,20 @@ apply plugin: 'com.android.application'
 android {
     namespace = "com.codebridgex.webapp"
     compileSdk = rootProject.ext.compileSdkVersion
+    signingConfigs {
+        release {
+            storeFile file('../keystore/sam-release.jks')
+            storePassword 'sam2025release'
+            keyAlias 'sam-release'
+            keyPassword 'sam2025release'
+        }
+    }
     defaultConfig {
         applicationId "com.codebridgex.webapp"
         minSdkVersion rootProject.ext.minSdkVersion
         targetSdkVersion rootProject.ext.targetSdkVersion
         versionCode 1
-        versionName "1.0"
+        versionName "0.1"
         testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
         aaptOptions {
              // Files and dirs to omit from the packaged assets dir, modified to accommodate modern web apps.
@@ -18,6 +26,7 @@ android {
     }
     buildTypes {
         release {
+            signingConfig signingConfigs.release
             minifyEnabled false
             proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
         }