Feature/encrypt sensitive storage - #194
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Core infrastructure built
EncryptionService — AES-256-GCM via Web Crypto API, PBKDF2 key derivation (100k iterations), unique IV + salt per write, session-scoped key
IndexedDBService — structured async storage with TTL expiration, bulk cleanup, and stats
SecureStorageV2Service — unified API combining encryption + IndexedDB + GDPR consent + PII detection
StorageMigrationService — one-time automatic migration from plaintext localStorage to encrypted IndexedDB
Closes #164