- Add crypto utility (internal/utils/crypto.go) with AES-256-GCM encrypt/decrypt
using SYSTEM_AES_KEY env var, with "enc:v1:" prefix for versioned ciphertext
- Encrypt tenant API key via GORM BeforeSave/AfterFind hooks and manual
encryption in CreateTenant/UpdateAPIKey (db.Updates bypasses hooks)
- Encrypt model API key in ModelParameters Value/Scan (driver.Valuer)
- Widen api_key column from varchar(64) to varchar(256) across all DB dialects
(MySQL, ParadeDB, SQLite) and add versioned migration 000018
- Propagate SYSTEM_AES_KEY through docker-compose, Helm secrets and values
- Fix migration 000017 PL/pgSQL dollar-quoting syntax ($ -> $$)
AndyYang