Add core modules (SSH args parser, cache, resolver, NetBox client) with tests

internal/resolver/strategy.go

@@ -0,0 +1,17 @@
+package resolver
+
+import (
+	"context"
+	"errors"
+
+	"git.zb-server.de/Sebi/ssh-netbox-wrapper/internal/netbox"
+)
+
+// ErrNoIP is returned when a strategy cannot find a matching IP address.
+var ErrNoIP = errors.New("no matching IP found")
+
+// Strategy is a single rule for resolving an IP address from a NetBox host entry.
+type Strategy interface {
+	Name() string
+	Resolve(ctx context.Context, entry *netbox.HostEntry, client *netbox.Client) (string, error)
+}