fix: add default avatar placeholder and correct debug API URL

- orderdetail: add fallback avatar image and onAvatarError handler
- Android: point debug build to cloud server (101.43.95.130)

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

peizhen/app/build.gradle

@@ -33,8 +33,8 @@ android {
 
     buildTypes {
         debug {
-            // 开发环境 —— 连接本地后端，需改为本机IP
-            buildConfigField "String", "API_BASE_URL", '"http://192.168.1.100:8039"'
+            // 开发环境 —— 连接云服务器
+            buildConfigField "String", "API_BASE_URL", '"http://101.43.95.130:8039"'
             minifyEnabled false
             proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
         }