Fix CI failures in peer ping implementation

Fixed multiple issues causing CI failures:
- Fixed C++ build on Linux by excluding macOS-specific source files in miner/core/tests/CMakeLists.txt.
- Fixed Go test panic in pkg/mining/manager_test.go by properly checking for nil return from StartMiner.
- Fixed runtime panic in pkg/mining/service.go where generateRequestID was attempting to base64 decode a timestamp string; replaced with crypto/rand.
- Verified removal of unused fmt import in pkg/ueps/packet.go.

miner/core/tests/CMakeLists.txt

@@ -18,8 +18,13 @@ list(FILTER MINER_SOURCES EXCLUDE REGEX ".*_riscv.*")
 if (WIN32)
     list(FILTER MINER_SOURCES EXCLUDE REGEX ".*_unix\\.cpp$")
     list(FILTER MINER_SOURCES EXCLUDE REGEX ".*_linux\\.cpp$")
+    list(FILTER MINER_SOURCES EXCLUDE REGEX ".*_mac\\.cpp$")
+elseif (APPLE)
+    list(FILTER MINER_SOURCES EXCLUDE REGEX ".*_win\\.cpp$")
+    list(FILTER MINER_SOURCES EXCLUDE REGEX ".*_linux\\.cpp$")
 else()
     list(FILTER MINER_SOURCES EXCLUDE REGEX ".*_win\\.cpp$")
+    list(FILTER MINER_SOURCES EXCLUDE REGEX ".*_mac\\.cpp$")
 endif()
 
 # Create a library with common test utilities and miner components

pkg/mining/manager_test.go

@@ -151,7 +151,14 @@ func TestGetMiner_Good(t *testing.T) {
 	}
 
 	// Case 1: Get an existing miner
-	startedMiner, _ := m.StartMiner(context.Background(), "xmrig", config)
+	startedMiner, err := m.StartMiner(context.Background(), "xmrig", config)
+	if err != nil {
+		t.Fatalf("Failed to start miner: %v", err)
+	}
+	if startedMiner == nil {
+		t.Fatal("StartMiner returned nil miner")
+	}
+
 	retrievedMiner, err := m.GetMiner(startedMiner.GetName())
 	if err != nil {
 		t.Fatalf("Expected to get miner, but got error: %v", err)

pkg/mining/service.go

@@ -2,6 +2,7 @@ package mining
 
 import (
 	"context"
+	"crypto/rand"
 	"encoding/base64"
 	"encoding/json"
 	"fmt"
@@ -203,9 +204,12 @@ func requestIDMiddleware() gin.HandlerFunc {
 
 // generateRequestID creates a unique request ID using timestamp and random bytes
 func generateRequestID() string {
-	b := make([]byte, 8)
-	_, _ = base64.StdEncoding.Decode(b, []byte(fmt.Sprintf("%d", time.Now().UnixNano())))
-	return fmt.Sprintf("%d-%x", time.Now().UnixMilli(), b[:4])
+	b := make([]byte, 4)
+	if _, err := rand.Read(b); err != nil {
+		// Fallback if random source fails (unlikely)
+		return fmt.Sprintf("%d", time.Now().UnixNano())
+	}
+	return fmt.Sprintf("%d-%x", time.Now().UnixMilli(), b)
 }
 
 // getRequestID extracts the request ID from gin context

pkg/ueps/packet.go

@@ -6,7 +6,6 @@ import (
 	"crypto/sha256"
 	"encoding/binary"
 	"errors"
-	"fmt"
 	"io"
 )