feat(i18n+tz): ADR-0076 + browser timezone detection + language resol… #24

Job	Run time
Hardcoded Secrets Detection	3s
CodeQL (.NET Backend)	37s
Dependency Vulnerability Review	8s
CodeQL (TypeScript/React)	1m 45s
npm Vulnerability Audit	-1s
Docker Image Security Scan	-1s
NuGet Vulnerability Audit	-1s
Tenant Isolation Security Tests	-1s
Security Gate	4s
Security Scan Report	4s
	2m 37s

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