refactor(storage): new storage file structure

- new directory structure containing manifest.json and one json file per provider, by default.
- the manifest.json file can specify a filepath for each vpn provider
- each vpn provider json data file can contain the `"preferred": true` field to enforce it is used even if outdated, unless there is a version mismatch
- `STORAGE_SERVERS_DIRECTORY_PATH` replaces `STORAGE_FILEPATH` (which is now a migration source only). It sets the directory where server manifest and per-provider JSON files are stored (default: `/gluetun/servers/`).
- First-run migration: On startup, gluetun checks for the old /gluetun/servers.json file; if found and no new manifest exists, it automatically migrates all data to /gluetun/servers/ directory structure
- Silent fallback: If legacy file isn't found, uses the new directory path normally
- Legacy cleanup: After successful migration, attempts to remove the old fat JSON file (logs warning only if removal fails, e.g., read-only bind mounts)

gluetun-servers/pkg/updaters/providers/expressvpn/updater.go

@@ -0,0 +1,29 @@
+package expressvpn
+
+import (
+	"github.com/qdm12/gluetun-servers/pkg/updaters/common"
+)
+
+type Updater struct {
+	unzipper         common.Unzipper
+	parallelResolver common.ParallelResolver
+	warner           common.Warner
+}
+
+func New(unzipper common.Unzipper, warner common.Warner,
+	parallelResolver common.ParallelResolver,
+) *Updater {
+	return &Updater{
+		unzipper:         unzipper,
+		parallelResolver: parallelResolver,
+		warner:           warner,
+	}
+}
+
+func (u *Updater) Version() uint16 {
+	return 2 //nolint:mnd
+}
+
+func (u *Updater) Name() string {
+	return "expressvpn"
+}