Initial commit: Lunar calendar converter project

- Add lunar calendar astronomical calculation engine (lunar_calendar.py)
- Add converter utilities for solar/lunar date conversion
- Add historical era name conversions (chrono_converter.py, converter_with_eras.py)
- Add FastAPI REST API for date conversion services
- Add age calculator using lunar calendar
- Add batch generation script for lunar calendar JSON data
- Add project documentation (CLAUDE.md, pyproject.toml)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

.gitignore

@@ -0,0 +1,26 @@
+# Local editor/credentials files
+.vscode/sftp.json
+
+# Python caches
+__pycache__/
+*.pyc
+.pytest_cache/
+.ruff_cache/
+.mypy_cache/
+
+# Build outputs
+build/
+dist/
+
+# Virtual environment
+.venv/
+venv/
+
+# Generated lunar calendar data
+lunar_json/
+
+# JPL ephemeris files (large binary files, download separately)
+*.bsp
+
+# tar archives
+*.tar.gz