initial commit: Artifacto v0.1

Self-hosted HTML artifact publisher. Single Go binary, SQLite metadata,
HTML on disk. Features: password-protected artifacts, per-artifact expiration,
admin dashboard with view metrics (privacy-preserving daily-salt visitor hash,
sparklines, 30-day SVG chart, top referrers), rate-limited unlock endpoint.

Packaged as a Docker image (two-stage, CGO_ENABLED=0, pure-Go SQLite).

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

internal/server/render.go

@@ -0,0 +1,16 @@
+package server
+
+import (
+	"bytes"
+	"net/http"
+)
+
+func (s *Server) render(w http.ResponseWriter, name string, data any) {
+	var buf bytes.Buffer
+	if err := s.tmpl.ExecuteTemplate(&buf, name, data); err != nil {
+		http.Error(w, "template: "+err.Error(), http.StatusInternalServerError)
+		return
+	}
+	w.Header().Set("Content-Type", "text/html; charset=utf-8")
+	_, _ = w.Write(buf.Bytes())
+}