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- each vpn provider json data file can contain the `"preferred": true` field to enforce it is used even if outdated, unless there is a version mismatch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/publicip/api/interfaces.go

@@ -0,0 +1,24 @@
+package api
+
+import (
+	"context"
+	"net/netip"
+
+	"github.com/qdm12/gluetun-servers/pkg/publicip/models"
+)
+
+type Fetcher interface {
+	String() string
+	CanFetchAnyIP() bool
+	Token() (token string)
+	InfoFetcher
+}
+
+type InfoFetcher interface {
+	FetchInfo(ctx context.Context, ip netip.Addr) (
+		result models.PublicIP, err error)
+}
+
+type Warner interface {
+	Warn(message string)
+}