feat: scaffold traefik-llmgateway plugin skeleton with manifest

logger.go

@@ -0,0 +1,18 @@
+package traefikllmgateway
+
+import (
+	"fmt"
+	"os"
+)
+
+// logf writes an info-level log line to stderr. No timestamps — Traefik
+// adds its own. Never log key material.
+func (g *Gateway) logf(format string, args ...any) {
+	fmt.Fprintf(os.Stderr, "llmgw[%s] INFO "+format+"\n", append([]any{g.name}, args...)...)
+}
+
+// errorf writes an error-level log line to stderr. No timestamps — Traefik
+// adds its own. Never log key material.
+func (g *Gateway) errorf(format string, args ...any) {
+	fmt.Fprintf(os.Stderr, "llmgw[%s] ERROR "+format+"\n", append([]any{g.name}, args...)...)
+}