docs(devops): update stale mywisprai/MyWisprAI branding across 5 AKV docs
- BytelystAI → ByteLyst in titles
- MyWisprAI → LysnrAI (legacy) for wispr-* secret references
- Added 'legacy resource name' annotations to Azure resource names
(kv-mywisprai, cosmos-mywisprai, etc. cannot be renamed)
- Updated dashboard paths (admin-web moved to dashboards/)
- Fixed telemetry role name: mywisprai-admin → lysnrai-admin
- Updated last-updated dates to 2026-03-21
Files: AZURE_KEY_VAULT_AND_SECRETS_ROTATION.md,
AZURE_PORTAL_SETUP.md, AZURE_RESOURCE_INVENTORY.md,
ENVIRONMENT_VARIABLES_AND_KEYVAULT_AUDIT.md,
END_TO_END_ENCRYPTION_ROADMAP.md
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