chore: disabled mint_management_rpc. update ln_backend

crates/cdk-mintd/example.config.toml

@@ -7,7 +7,7 @@ mnemonic = ""
 # enable_swagger_ui = false
 
 [mint_management_rpc]
-# enabled = false
+enabled = false
 # address = "127.0.0.1"
 # port = 8086
 
@@ -43,7 +43,7 @@ tti = 60
 
 [ln]
 # Required ln backend `cln`, `lnd`, `fakewallet`, 'lnbits'
-ln_backend = "cln"
+ln_backend = "fakewallet"
 # min_mint=1
 # max_mint=500000
 # min_melt=1