Fix/realtime django models tripupdates vehiclepositions alerts subissue 13#12

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jloria2703 wants to merge 3 commits intomainfrom

fix/realtime-django-models-tripupdates-vehiclepositions-alerts-subissue-13

Commits on Sep 30, 2025

feat(realtime): add source-of-truth schema.json and import databus/infobus functions
jloria2703
committed

Commits on Oct 11, 2025

feat(realtime): implement feed serialization and deserialization using gtfs-realtime-bindings
jorge.loriachaves
committed

Commits on Oct 12, 2025

fix(realtime): correct and complete Django models for TripUpdates, VehiclePositions, and Alerts
jorge.loriachaves
committed