Add configurable LNbits invoice memos and pubkey metadata

Read INVOICE_MEMO_YEARLY and INVOICE_MEMO_LIFETIME from the environment
and pass the user pubkey in LNbits payment extra for invoice creation.

internal/config/config.go

@@ -10,12 +10,14 @@ import (
 )
 
 type LightningConfig struct {
-	Enabled            bool
-	LNbitsURL          string
-	LNbitsInvoiceKey   string
-	PriceYearlySats    int64
-	PriceLifetimeSats  int64
-	InvoiceExpiryMins  int
+	Enabled             bool
+	LNbitsURL           string
+	LNbitsInvoiceKey    string
+	PriceYearlySats     int64
+	PriceLifetimeSats   int64
+	InvoiceExpiryMins   int
+	InvoiceMemoYearly   string
+	InvoiceMemoLifetime string
 }
 
 type NostrConfig struct {
@@ -77,12 +79,14 @@ func Load() (*Config, error) {
 		FrontendURL:  env("FRONTEND_URL", ""),
 		DatabasePath: env("DATABASE_PATH", ".data/nip05.db"),
 		Lightning: LightningConfig{
-			Enabled:           envBool("LIGHTNING_ENABLED", true),
-			LNbitsURL:         env("LNBITS_URL", ""),
-			LNbitsInvoiceKey:  env("LNBITS_INVOICE_KEY", ""),
-			PriceYearlySats:   int64(envInt("PRICE_YEARLY_SATS", 1000)),
-			PriceLifetimeSats: int64(envInt("PRICE_LIFETIME_SATS", 10000)),
-			InvoiceExpiryMins: envInt("INVOICE_EXPIRY_MINUTES", 30),
+			Enabled:             envBool("LIGHTNING_ENABLED", true),
+			LNbitsURL:           env("LNBITS_URL", ""),
+			LNbitsInvoiceKey:    env("LNBITS_INVOICE_KEY", ""),
+			PriceYearlySats:     int64(envInt("PRICE_YEARLY_SATS", 1000)),
+			PriceLifetimeSats:   int64(envInt("PRICE_LIFETIME_SATS", 10000)),
+			InvoiceExpiryMins:   envInt("INVOICE_EXPIRY_MINUTES", 30),
+			InvoiceMemoYearly:   env("INVOICE_MEMO_YEARLY", "Noderunners Relay yearly Access"),
+			InvoiceMemoLifetime: env("INVOICE_MEMO_LIFETIME", "Noderunners Relay lifetime Access"),
 		},
 		Nostr: NostrConfig{
 			Relays:              csv(env("RELAYS", "")),