feat(flight): KML trajectory export endpoint

[aasitvora99]

GET /flights/{id}/kml returns a KML file of the flight trajectory.

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[Copilot]

Pull request overview

Adds support for exporting a flight’s trajectory as a Google Earth KML download via a new GET /flights/{id}/kml endpoint, integrating the route/controller/service layers and covering the new behavior with unit tests.

Changes:

• Added GET /flights/{flight_id}/kml route returning a KML file download response.
• Implemented controller + service support for generating KML bytes using RocketPy’s FlightDataExporter.
• Added route unit tests for success, 404, and 500 cases.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 1 comment.

File	Description
tests/unit/test_routes/test_flights_route.py	Adds unit tests validating KML endpoint response bytes, headers, and error propagation.
src/services/flight.py	Implements KML export in FlightService using FlightDataExporter and a temporary file.
src/routes/flight.py	Adds the /flights/{flight_id}/kml endpoint returning a KML file download response.
src/controllers/flight.py	Exposes get_flight_kml() controller method with standard exception handling wrapper.

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