implemented the property-valuation-api

[KAMALDEEN333]

Created a property valuation API that integrates with external ML services to provide automated property value estimates based on market data, location, and property features.

Acceptance Criteria was successfully achieved
Integration with external valuation API (Zillow, Redfin, or similar)
Property feature extraction and normalization
Valuation confidence scoring
Historical valuation tracking
Market trend analysis integration
Caching strategy for valuation results
Error handling for API failures
Rate limiting for external API calls
Unit tests with 85% coverage
API documentation with examples
Files that was Modified:

src/valuation/ (new directory)
src/valuation/valuation.service.ts (new)
src/valuation/valuation.controller.ts (new)
src/property/property.model.ts (modify)
config/valuation.config.ts (new)
test/valuation/ (new directory)

closes #11

[github-advanced-security]

This pull request sets up GitHub code scanning for this repository. Once the scans have completed and the checks have passed, the analysis results for this pull request branch will appear on this overview. Once you merge this pull request, the 'Security' tab will show more code scanning analysis results (for example, for the default branch). Depending on your configuration and choice of analysis tool, future pull requests will be annotated with code scanning analysis results. For more information about GitHub code scanning, check out the documentation.