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/internal/graph/server.go

@@ -0,0 +1,28 @@
+package graph
+
+import (
+	"net/http"
+
+	"github.com/brasse-b/archivum/internal/config"
+)
+
+// NewServer wires up the HTTP handler for the GraphQL endpoint.
+// Replace the stub handler with the gqlgen-generated handler once
+// `go generate ./...` has been run.
+func NewServer(cfg *config.Config) http.Handler {
+	mux := http.NewServeMux()
+
+	// Placeholder — replace with generated gqlgen handler.
+	mux.HandleFunc("/graphql", func(w http.ResponseWriter, r *http.Request) {
+		w.Header().Set("Content-Type", "application/json")
+		w.WriteHeader(http.StatusOK)
+		_, _ = w.Write([]byte(`{"data":{"systemStatus":"REQUIRE_SETUP"}}`))
+	})
+
+	// Simple health check.
+	mux.HandleFunc("/health", func(w http.ResponseWriter, r *http.Request) {
+		w.WriteHeader(http.StatusOK)
+	})
+
+	return mux
+}