- Accept only PDF and JSON files in import modal and API - Convert PDF statements to JSON 1.0 via LLM (OpenAI-compatible) - Use multipart/form-data for file upload (multer, 15 MB limit) - Add LLM_API_KEY and LLM_API_BASE_URL for configurable LLM endpoint - Update ImportModal to validate type and send FormData - Add postFormData to API client for file upload