Implement built-in auth #106

Job	Run time
E2E / Playwright E2E	7m 25s
Plugins / Lint (Simple Plugins)	59s
Plugins / Lint (NLLB)	2m 11s
Plugins / Lint (Sherpa-ONNX Plugins)	1m 0s
UI / Lint (TypeScript + ESLint)	42s
Plugins / Lint (Whisper)	1m 4s
UI / Build	25s
Skit / Lint (fmt + clippy)	8m 21s
Plugins / Format Check	21s
UI / Test	22s
Skit / Test	5m 42s
Skit / Build	12m 25s
All Checks Passed	2s
	40m 59s

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