backend: add api key authentication

[vnghia]

No description provided.

[codecov]

❌ 2 Tests Failed:

Tests completed	Failed	Passed	Skipped
376	2	374	0

View the full list of 2 ❄️ flaky tests

nghe_backend file::audio::artist::tests::test_artists_upsert::compilation_2_false::update_artists_1_true

Flake rate in main: 8.00% (Passed 46 times, Failed 4 times)

Stack Traces | 1.15s run time

No failure message available

nghe_backend scan::scanner::tests::test_full_scan::full_1_true

Flake rate in main: 6.25% (Passed 120 times, Failed 8 times)

Stack Traces | 1.22s run time

No failure message available

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