Rename to reflect multi-provider support (OpenAI + Anthropic):
- Rename Services/OpenAIReceiptParser.cs to Services/AIReceiptParser.cs
- Update class name from OpenAIReceiptParser to AIReceiptParser
- Update DI registration in Program.cs
The parser now supports both OpenAI and Anthropic models, so the more generic name better reflects its capabilities.
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>