feat: nwc

app/src/main/java/com/bitcointxoko/gudariwallet/api/Models.kt

@@ -322,3 +322,43 @@ data class PaginatedPaymentsResponse(
     @SerializedName("data")  val data:  List<PaymentRecord>,
     @SerializedName("total") val total: Int
 )
+
+// ── NWC Provider models ───────────────────────────────────────────────────────
+
+data class NwcKey(
+    val pubkey: String,
+    val wallet: String,
+    val description: String,
+    val expires_at: Long,
+    val permissions: String,       // comma-separated permission names
+    val created_at: Long,
+    val last_used: Long
+)
+
+data class NwcBudget(
+    val id: Int,
+    val pubkey: String,
+    val budget_msats: Long,
+    val refresh_window: Int,       // seconds
+    val created_at: Long,
+    val used_budget_msats: Long = 0
+)
+
+/** Response for GET /nwc and GET /nwc/{pubkey} */
+data class NwcGetResponse(
+    val data: NwcKey,
+    val budgets: List<NwcBudget>
+)
+
+data class NwcNewBudget(
+    val budget_msats: Long,
+    val refresh_window: Int        // seconds
+)
+
+/** Request body for PUT /nwc/{pubkey} */
+data class NwcRegistrationRequest(
+    val permissions: List<String>,
+    val description: String,
+    val expires_at: Long,          // unix timestamp; 0 = no expiry
+    val budgets: List<NwcNewBudget> = emptyList()
+)