feat: initial Go project scaffold with build/test/release pipeline

- Go module: github.com/netcell-it/deklarix
- cmd/server/main.go: HTTP entry point with /health endpoint
- scripts/build.sh: cross-compile amd64 + arm64
- scripts/test.sh: go vet + race tests + build-check
- scripts/release.sh: full release flow (test → build → tag → push)
- packaging/DEBIAN: .deb control template
- design/enterprise.css: enterprise design system from enconf
- CLAUDE.md: complete build/test/release documentation
- .claude/settings.local.json: Claude Code permissions

cmd/server/main.go

@@ -0,0 +1,27 @@
+package main
+
+import (
+	"fmt"
+	"log"
+	"net/http"
+	"os"
+)
+
+func main() {
+	port := os.Getenv("PORT")
+	if port == "" {
+		port = "8080"
+	}
+	addr := ":" + port
+
+	mux := http.NewServeMux()
+	mux.HandleFunc("/health", func(w http.ResponseWriter, r *http.Request) {
+		w.Header().Set("Content-Type", "application/json")
+		fmt.Fprintf(w, `{"ok":true}`)
+	})
+
+	log.Printf("Deklarix server starting on %s", addr)
+	if err := http.ListenAndServe(addr, mux); err != nil {
+		log.Fatal(err)
+	}
+}