feat(analytics): add location anonymization service for map privacy

[walterthesmart]

Title: Location Anonymization Service for Map Privacy

Resolves #222

Tasks and Fixes Made

1. Created PrivacyService:

   • Implemented an algorithm to fuzz geo-coordinates and protect the exact locations.
   • Using a deterministic hash based on coordinates to add an offset within a 500m to 1km radius limit.
   • Added logic to keep fuzzing consistent for the same location to prevent jumping.

2. Backend Module Updating:

   • Implemented getMapAnonymizedData inside AnalyticsService formatting to standardized GeoJsonFeatureCollection.
   • Exposed GET /analytics/map-anonymized inside AnalyticsController.

3. Data Transfer Objects (DTOs):

   • Built out GeoJsonFeature and GeoJsonFeatureCollection definition for the endpoint types.

4. CI Checks Verified:

   • Nest.js backend tests passed smoothly without regressions.
   • Project dependencies correctly build.

Please review and merge.

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