refactor: Update ActionType to include costs and modified grader for task 1

fix: Handle optional request body in reset endpoint and set default task ID

fix: Update API responses to return JSON format and remove deprecated file references

fix: update file path for landing page in root endpoint

html file path and api corrected

fix: Update file paths and ensure model loading in PropertyRetriever

feat: Add landing page and API documentation

fix import paths in app.py to reflect correct module structure

Structure Changed, files reviewed