Add FastAPI image generation service

Provide containerized GPT and Grok image generation with environment-based configuration.

Dockerfile

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+FROM python:3.12-slim
+
+WORKDIR /app
+
+COPY requirements.txt .
+RUN pip install --no-cache-dir -r requirements.txt
+
+COPY agent-image-t2i.py .
+RUN mkdir -p /app/output
+
+EXPOSE 8000
+
+CMD ["uvicorn", "agent-image-t2i:app", "--host", "0.0.0.0", "--port", "8000"]