Migrate simple flat enums to UniFFI proc-macro export

Migrate `WordCount`, `PaymentDirection`, `PaymentStatus`, and
`AsyncPaymentsRole` from UDL enum definitions to proc-macro
`#[derive(uniffi::Enum)]` on their Rust source types, replacing
the UDL definitions with `typedef enum` references.

Generated with the help of AI (Claude Code).

Co-Authored-By: HAL 9000

Author: tnull

bindings/ldk_node.udl

@@ -71,13 +71,7 @@ enum EntropyError {
 	"InvalidSeedFile",
 };
 
-enum WordCount {
-	"Words12",
-	"Words15",
-	"Words18",
-	"Words21",
-	"Words24",
-};
+typedef enum WordCount;
 
 [Remote]
 enum LogLevel {
@@ -448,16 +442,9 @@ interface UnifiedPaymentResult {
 	Bolt12(PaymentId payment_id);
 };
 
-enum PaymentDirection {
-	"Inbound",
-	"Outbound",
-};
+typedef enum PaymentDirection;
 
-enum PaymentStatus {
-	"Pending",
-	"Succeeded",
-	"Failed",
-};
+typedef enum PaymentStatus;
 
 dictionary LSPFeeLimits {
 	u64? max_total_opening_fee_msat;
@@ -744,10 +731,7 @@ enum Currency {
 	"Signet",
 };
 
-enum AsyncPaymentsRole {
-	"Client",
-	"Server",
-};
+typedef enum AsyncPaymentsRole;
 
 dictionary RouteHintHop {
 	PublicKey src_node_id;

src/config.rs

@@ -595,6 +595,7 @@ impl From<MaxDustHTLCExposure> for LdkMaxDustHTLCExposure {
 }
 
 #[derive(Debug, Clone, Copy)]
+#[cfg_attr(feature = "uniffi", derive(uniffi::Enum))]
 /// The role of the node in an asynchronous payments context.
 ///
 /// See <https://github.com/lightning/bolts/pull/1149> for more information about the async payments protocol.

src/entropy.rs

@@ -125,6 +125,7 @@ pub fn generate_entropy_mnemonic(word_count: Option<WordCount>) -> Mnemonic {
 
 /// Supported BIP39 mnemonic word counts for entropy generation.
 #[derive(Debug, Clone, Copy, PartialEq, Eq)]
+#[cfg_attr(feature = "uniffi", derive(uniffi::Enum))]
 pub enum WordCount {
 	/// 12-word mnemonic (128-bit entropy)
 	Words12,

src/payment/store.rs

@@ -317,6 +317,7 @@ impl StorableObject for PaymentDetails {
 
 /// Represents the direction of a payment.
 #[derive(Copy, Clone, Debug, PartialEq, Eq)]
+#[cfg_attr(feature = "uniffi", derive(uniffi::Enum))]
 pub enum PaymentDirection {
 	/// The payment is inbound.
 	Inbound,
@@ -331,6 +332,7 @@ impl_writeable_tlv_based_enum!(PaymentDirection,
 
 /// Represents the current status of a payment.
 #[derive(Copy, Clone, Debug, PartialEq, Eq)]
+#[cfg_attr(feature = "uniffi", derive(uniffi::Enum))]
 pub enum PaymentStatus {
 	/// The payment is still pending.
 	Pending,