Dev 02955199f6 feat(01-04): MsalClientFactory with per-clientId PCA and MsalCacheHelper ...

- Creates one IPublicClientApplication per ClientId (never shared)
- Persists token cache to configurable directory (default: %AppData%\SharepointToolbox\auth\msal_{clientId}.cache)
- SemaphoreSlim(1,1) prevents duplicate creation under concurrent calls
- CacheDirectory property exposed for test injection
- 4 unit tests: same-instance, different-instance, concurrent, AppData path

2026-04-02 12:22:54 +02:00

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