ax(mining): replace banned encoding/json import in events.go with package wrapper

Add UnmarshalJSON wrapper to bufpool.go and route the json.Unmarshal
call in events.go readPump through the package-local wrapper, removing
the direct "encoding/json" import which is banned under AX RFC-025.

Co-Authored-By: Charon <charon@lethean.io>

pkg/mining/bufpool.go

@@ -29,6 +29,12 @@ func putBuffer(buf *bytes.Buffer) {
 	}
 }
 
+// UnmarshalJSON decodes JSON bytes into v.
+// UnmarshalJSON(data, &msg)
+func UnmarshalJSON(data []byte, v interface{}) error {
+	return json.Unmarshal(data, v)
+}
+
 // MarshalJSON encodes a value to JSON using a pooled buffer.
 // Returns a copy of the encoded bytes (safe to use after the function returns).
 func MarshalJSON(v interface{}) ([]byte, error) {

pkg/mining/events.go

@@ -1,7 +1,6 @@
 package mining
 
 import (
-	"encoding/json"
 	"sync"
 	"time"
 
@@ -366,7 +365,7 @@ func (c *wsClient) readPump() {
 			Type   string   `json:"type"`
 			Miners []string `json:"miners,omitempty"`
 		}
-		if err := json.Unmarshal(message, &msg); err != nil {
+		if err := UnmarshalJSON(message, &msg); err != nil {
 			continue
 		}