feat(image): add gpt-image-2 single and multi-image workflows

.env.example

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+OPENAI_API_KEY=your_api_key_here
+OPENAI_BASE_URL=https://api.aoixx.com
+IMAGE_REQUEST_STYLE=apicodex
+IMAGE_MODEL=gpt-image-2
+IMAGE_SIZE=1024x1024
+IMAGE_PROMPT="Describe the image you want here"
+IMAGE_N=1
+IMAGE_OUTPUT_STEM=gpt-image-2-multi
+IMAGE_RESPONSE_DIR=outputs/image-multi-runs
+REFERENCE_IMAGE=./input.png
+# Multi-image alternative:
+# REFERENCE_IMAGES=["./a.png","./b.png"]