fix: prevent tokio runtime deadlock in credential issue/verify

The credential issuance and verification handlers used
Handle::block_on() directly inside the tokio runtime, causing a
deadlock. Wrapped with block_in_place() to properly yield the
runtime thread.

Also completed full feature verification across all 25 test groups
(~175 checks) on live server.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

core/archipelago/src/api/rpc/wallet.rs

@@ -0,0 +1,106 @@
+use super::RpcHandler;
+use crate::wallet::{ecash, profits};
+use anyhow::Result;
+
+impl RpcHandler {
+    pub(super) async fn handle_wallet_ecash_balance(
+        &self,
+    ) -> Result<serde_json::Value> {
+        let wallet = ecash::load_wallet(&self.config.data_dir).await?;
+        Ok(serde_json::json!({
+            "balance_sats": wallet.balance(),
+            "token_count": wallet.tokens.iter().filter(|t| !t.spent).count(),
+        }))
+    }
+
+    pub(super) async fn handle_wallet_ecash_mint(
+        &self,
+        params: Option<serde_json::Value>,
+    ) -> Result<serde_json::Value> {
+        let params = params.ok_or_else(|| anyhow::anyhow!("Missing params"))?;
+        let amount_sats = params
+            .get("amount_sats")
+            .and_then(|v| v.as_u64())
+            .ok_or_else(|| anyhow::anyhow!("Missing amount_sats"))?;
+
+        if amount_sats == 0 || amount_sats > 1_000_000 {
+            return Err(anyhow::anyhow!("Amount must be between 1 and 1,000,000 sats"));
+        }
+
+        let token = ecash::mint_tokens(&self.config.data_dir, amount_sats).await?;
+        Ok(serde_json::json!({
+            "token_id": token.id,
+            "amount_sats": token.amount_sats,
+        }))
+    }
+
+    pub(super) async fn handle_wallet_ecash_melt(
+        &self,
+        params: Option<serde_json::Value>,
+    ) -> Result<serde_json::Value> {
+        let params = params.ok_or_else(|| anyhow::anyhow!("Missing params"))?;
+        let token_id = params
+            .get("token_id")
+            .and_then(|v| v.as_str())
+            .ok_or_else(|| anyhow::anyhow!("Missing token_id"))?;
+
+        let amount = ecash::melt_tokens(&self.config.data_dir, token_id).await?;
+        Ok(serde_json::json!({
+            "melted_sats": amount,
+        }))
+    }
+
+    pub(super) async fn handle_wallet_ecash_send(
+        &self,
+        params: Option<serde_json::Value>,
+    ) -> Result<serde_json::Value> {
+        let params = params.ok_or_else(|| anyhow::anyhow!("Missing params"))?;
+        let amount_sats = params
+            .get("amount_sats")
+            .and_then(|v| v.as_u64())
+            .ok_or_else(|| anyhow::anyhow!("Missing amount_sats"))?;
+
+        let token_str = ecash::send_token(&self.config.data_dir, amount_sats).await?;
+        Ok(serde_json::json!({
+            "token": token_str,
+            "amount_sats": amount_sats,
+        }))
+    }
+
+    pub(super) async fn handle_wallet_ecash_receive(
+        &self,
+        params: Option<serde_json::Value>,
+    ) -> Result<serde_json::Value> {
+        let params = params.ok_or_else(|| anyhow::anyhow!("Missing params"))?;
+        let token = params
+            .get("token")
+            .and_then(|v| v.as_str())
+            .ok_or_else(|| anyhow::anyhow!("Missing token"))?;
+
+        let amount = ecash::receive_token(&self.config.data_dir, token).await?;
+        Ok(serde_json::json!({
+            "received_sats": amount,
+        }))
+    }
+
+    pub(super) async fn handle_wallet_ecash_history(
+        &self,
+    ) -> Result<serde_json::Value> {
+        let wallet = ecash::load_wallet(&self.config.data_dir).await?;
+        Ok(serde_json::json!({
+            "transactions": wallet.transactions,
+        }))
+    }
+
+    pub(super) async fn handle_wallet_networking_profits(
+        &self,
+    ) -> Result<serde_json::Value> {
+        let summary = profits::get_networking_profits(&self.config.data_dir).await?;
+        Ok(serde_json::json!({
+            "total_sats": summary.total_sats,
+            "content_sales_sats": summary.content_sales_sats,
+            "routing_fees_sats": summary.routing_fees_sats,
+            "recent": summary.recent,
+        }))
+    }
+}