Update system prompt and create D300 migration script
- Enhanced system_prompt.md with mandatory initial questions, explicit examples, operation types, error handling, and BEGIN/END structure requirements
- Created ff_2025_09_10_01_CONTABILITATE_D300.sql migration script for DECONTTVA table with DELETE/INSERT approach
- Removed obsolete files: CLAUDE.md, README.md, CSV input files
- Updated input/scrie_jc_2007.sql
🤖 Generated with [Claude Code](https://claude.ai/code)
Co-Authored-By: Claude <noreply@anthropic.com>
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