Add separate test scripts for config priority testing

- test-env-vars.sh: Test environment variables only
- test-temp-config.sh: Test with temporary custom config file

🤖 Generated with [Claude Code](https://claude.ai/code)

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

Author: kwonah0

scripts/test-env-vars.sh

@@ -0,0 +1,22 @@
+#!/bin/bash
+
+# Test with environment variables only
+echo "🚀 Testing with environment variables only"
+echo "=========================================="
+
+echo "Environment variables:"
+echo "  DTUI_CFG__ai__shell__command=echo"
+echo "  DTUI_CFG__ai__shell__args='[\"[ENV_VARS_ONLY]:\"]'"
+echo "  DTUI_CFG__ai__shell__template='{command} {args} \"{prompt}\"'"
+echo ""
+echo "Expected output: [ENV_VARS_ONLY]: <your_message>"
+echo "Look for: 'No DTUI_USER_CONFIGFILE specified, skipping user config file stage'"
+echo ""
+echo "Press Ctrl+C to stop the app when done testing..."
+echo ""
+
+# Launch with environment variables only
+DTUI_CFG__ai__shell__command=echo \
+DTUI_CFG__ai__shell__args='["[ENV_VARS_ONLY]:"]' \
+DTUI_CFG__ai__shell__template='{command} {args} "{prompt}"' \
+npm run electron

scripts/test-temp-config.sh

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+#!/bin/bash
+
+# Test with temporary custom config file
+echo "🧪 Testing with temporary custom config file"
+echo "============================================"
+
+# Create temporary config file
+TEMP_CONFIG="/tmp/dtui-temp-config-$(date +%s).json"
+cat > "$TEMP_CONFIG" << 'EOF'
+{
+  "ai": {
+    "provider": "shell",
+    "shell": {
+      "command": "echo",
+      "args": ["[TEMP_CUSTOM_FILE]:"],
+      "template": "{command} {args} \"{prompt}\"",
+      "timeout": 12000,
+      "outputFormat": {
+        "useCodeBlock": true,
+        "codeBlockSyntax": "bash"
+      }
+    }
+  }
+}
+EOF
+
+echo "Created temporary config: $TEMP_CONFIG"
+echo "Config contents:"
+echo "$(cat $TEMP_CONFIG)"
+echo ""
+echo "Expected output: [TEMP_CUSTOM_FILE]: <your_message>"
+echo "Look for: 'Loaded user config file: $TEMP_CONFIG'"
+echo ""
+echo "Press Ctrl+C to stop the app when done testing..."
+echo ""
+
+# Launch with temporary config
+DTUI_USER_CONFIGFILE="$TEMP_CONFIG" npm run electron
+
+# Clean up
+echo ""
+echo "Cleaning up temporary config file: $TEMP_CONFIG"
+rm -f "$TEMP_CONFIG"
+echo "✅ Cleanup completed"