Add Get Sensor IDs Method

[keenanjohnson]

Resolves #27

[Copilot]

Pull request overview

Adds a new authenticated /sensors endpoint to list known sensor IDs, along with documentation and a small helper script for retrieving them from the API.

Changes:

• Added GET /sensors route in the server and documented the endpoint in the README.
• Implemented internal/sensors handler that queries InfluxDB for tag values (host) and returns them as JSON.
• Added Go tests for the new handler and a Python script to print sensor IDs from the CLI.

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
scripts/list_sensors.py	CLI helper to call /sensors and print returned sensor IDs.
README.md	Documents the new GET /sensors endpoint, auth requirements, and response shape.
main.go	Wires the new /sensors handler behind auth + rate limiting.
internal/sensors/sensors.go	Implements the /sensors handler and Influx query/serialization logic.
internal/sensors/sensors_test.go	Adds unit tests for handler behavior and query/id collection helpers.

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