Add fallback to fresh issuance if certificate renewal fails

Fix certificate parsing and UI display

Fix: Ensure FullChainPEM is saved and loaded in persist.go

Fix: Corrected syntax error in sqlite.go ScanRawRow function and staged all modified files

Fix: Ensure full certificate chain is provided to Envoy SDS

fix the rotation issue

add log for staging lets entrypt

fix secret name missing when issuing certificate

support graceful shutdown

modify the main code to allow graceful shutdown

implement the cert rotation

refactor the database middle layer to better orgranize the sql types

support manual rotation

add secret support

refactor code