fix(isolation): detect the runtime of Windows launchers with an .exe/.cmd suffix

DetectRuntimeType switched on the exact base name, so a Windows config
naming uvx.exe, npx.cmd, npm.cmd, pip.exe or go.exe fell to the
"binary" default. Docker isolation then picked the generic image and
ran e.g. npx.cmd inside a Linux container, where it does not exist, so
the server never started. Lowercase the base name and strip a .exe,
.cmd or .bat suffix before matching.

Author: rudycelekli

internal/upstream/core/isolation.go

@@ -220,8 +220,13 @@ func (im *IsolationManager) warnPerServerIgnoredOnce(serverName string) {
 
 // DetectRuntimeType detects the runtime type based on the command
 func (im *IsolationManager) DetectRuntimeType(command string) string {
-	// Extract just the command name without path
-	cmdName := filepath.Base(command)
+	// Extract just the command name without path or a Windows executable
+	// suffix (uvx.exe, npx.cmd), compared case-insensitively as Windows does.
+	cmdName := strings.ToLower(filepath.Base(command))
+	switch filepath.Ext(cmdName) {
+	case ".exe", ".cmd", ".bat":
+		cmdName = strings.TrimSuffix(cmdName, filepath.Ext(cmdName))
+	}
 
 	// Handle common runtime commands
 	switch cmdName {

internal/upstream/core/isolation_windows_ext_test.go

@@ -0,0 +1,30 @@
+package core
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+
+	"github.com/smart-mcp-proxy/mcpproxy-go/internal/config"
+)
+
+// Windows configs name launchers with their executable suffix (uvx.exe,
+// npx.cmd). Treating those as an unknown "binary" picks the generic image and
+// runs "npx.cmd" inside a Linux container, where it does not exist.
+func TestDetectRuntimeType_WindowsExecutableSuffix(t *testing.T) {
+	im := NewIsolationManager(config.DefaultDockerIsolationConfig())
+	cases := map[string]string{
+		"uvx.exe":  cmdUvx,
+		"npx.cmd":  cmdNpx,
+		"NPX.CMD":  cmdNpx,
+		"npm.cmd":  cmdNpm,
+		"yarn.cmd": cmdYarn,
+		"pip.exe":  cmdPip,
+		"go.exe":   cmdGo,
+		"uvx":      cmdUvx,
+		"my-tool":  "binary",
+	}
+	for cmd, want := range cases {
+		assert.Equal(t, want, im.DetectRuntimeType(cmd), cmd)
+	}
+}