feat: add Wine Z: path prefix for Windows platform on Linux host

- Add winePath helper that prepends Z: when platform is windows on Linux
- Thread platform through buildModPath, buildAutoArgs, and Start()
- Apply Z: prefix to -config=, -mod=, -profiles=, and %command% binary paths
- Add tests for winePath, buildAutoArgs, and buildModPath with platform param
- Fix formatting across services package with gofmt
- Include all prior bug fixes from this branch

backend/internal/services/settings.go

@@ -54,18 +54,18 @@ func (sm *SettingsManager) Save(s *models.ServerSettings) error {
 
 func (sm *SettingsManager) defaults() *models.ServerSettings {
 	return &models.ServerSettings{
-		IPPort:                "0.0.0.0:2302",
-		ServerParameters:      "-server -world=empty -loadMissionToMemory -noPause",
-		SteamBranch:           "stable",
-		SteamUser:             "anonymous",
-		Platform:              "linux",
-		ActiveConfig:          "",
-		ActiveModlist:         "",
-		AutoUpdateOnStartup:   false,
-		AutoStartOnStartup:    false,
+		IPPort:                  "0.0.0.0:2302",
+		ServerParameters:        "-server -world=empty -loadMissionToMemory -noPause",
+		SteamBranch:             "stable",
+		SteamUser:               "anonymous",
+		Platform:                "linux",
+		ActiveConfig:            "",
+		ActiveModlist:           "",
+		AutoUpdateOnStartup:     false,
+		AutoStartOnStartup:      false,
 		AutoUpdateModsOnStartup: false,
-		WasRunning:            false,
-		ScheduledUpdate:       "",
-		UpdatedAt:             time.Now().UTC(),
+		WasRunning:              false,
+		ScheduledUpdate:         "",
+		UpdatedAt:               time.Now().UTC(),
 	}
 }