for await...of on res.body isn't supported in Safari/mobile browsers.
reverted to getReader() approach which has broader support.

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

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

- pydantic-ai agents for moderation check and alt text generation
- transparent moderation result display
- token-by-token reasoning stream via SSE
- instructions field for customizing alt text output
- rate limiting, logfire integration, fly.io deployment

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

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>