feat: Archivum skeleton — Go/GraphQL backend + Vue 3 PWA frontend

Full project scaffold: multi-stage Dockerfile (ARM64/AMD64), AsciiDoc↔TipTap
bridge, Setup Wizard, CodeMirror source editor, Git-backed storage layer,
LDAP+JWT auth skeleton, Tailwind mobile-first layout, and VS Code build/push
tasks targeting registry at 192.168.0.19:5000.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

backend/cmd/server/main.go

@@ -0,0 +1,31 @@
+package main
+
+import (
+	"log"
+	"net/http"
+	"os"
+
+	"github.com/brasse-b/archivum/internal/config"
+	"github.com/brasse-b/archivum/internal/graph"
+)
+
+func main() {
+	cfg, err := config.Load(configPath())
+	if err != nil {
+		log.Fatalf("failed to load config: %v", err)
+	}
+
+	srv := graph.NewServer(cfg)
+
+	log.Printf("Archivum listening on %s", cfg.ListenAddr)
+	if err := http.ListenAndServe(cfg.ListenAddr, srv); err != nil {
+		log.Fatal(err)
+	}
+}
+
+func configPath() string {
+	if p := os.Getenv("DOCKER_PATH"); p != "" {
+		return p + "/config/config.json"
+	}
+	return "config.json"
+}