fix: load environment-specific .env files in iOS/Android/Electron build scripts

- iOS, Android, and Electron build scripts now load .env.development, .env.test, .env.production files
- Previously only loaded generic .env file which doesn't exist
- Ensures consistent image server URL across all build targets
- Fixes issue where build:ios:dev used production image URL instead of test URL
- Aligns with web build script behavior for environment variable precedence

Resolves inconsistent VITE_DEFAULT_IMAGE_API_SERVER values between build targets.

scripts/build-android.sh

@@ -351,8 +351,18 @@ fi
 # Setup application directories
 setup_app_directories
 
-# Load environment from .env file if it exists
-load_env_file ".env"
+# Load environment-specific .env file if it exists
+env_file=".env.$BUILD_MODE"
+if [ -f "$env_file" ]; then
+    load_env_file "$env_file"
+else
+    log_debug "No $env_file file found, using default environment"
+fi
+
+# Load .env file if it exists (fallback)
+if [ -f ".env" ]; then
+    load_env_file ".env"
+fi
 
 # Handle clean-only mode
 if [ "$CLEAN_ONLY" = true ]; then

scripts/build-electron.sh

@@ -341,7 +341,19 @@ main_electron_build() {
     # Setup environment
     setup_build_env "electron" "$BUILD_MODE"
     setup_app_directories
-    load_env_file ".env"
+    
+    # Load environment-specific .env file if it exists
+    env_file=".env.$BUILD_MODE"
+    if [ -f "$env_file" ]; then
+        load_env_file "$env_file"
+    else
+        log_debug "No $env_file file found, using default environment"
+    fi
+    
+    # Load .env file if it exists (fallback)
+    if [ -f ".env" ]; then
+        load_env_file ".env"
+    fi
     
     # Step 1: Clean Electron build artifacts
     clean_electron_artifacts

scripts/build-ios.sh

@@ -324,8 +324,18 @@ fi
 # Setup application directories
 setup_app_directories
 
-# Load environment from .env file if it exists
-load_env_file ".env"
+# Load environment-specific .env file if it exists
+env_file=".env.$BUILD_MODE"
+if [ -f "$env_file" ]; then
+    load_env_file "$env_file"
+else
+    log_debug "No $env_file file found, using default environment"
+fi
+
+# Load .env file if it exists (fallback)
+if [ -f ".env" ]; then
+    load_env_file ".env"
+fi
 
 # Validate iOS environment
 validate_ios_environment