Initial lookbook implementation

Pinterest-style visual bookmarking app with:
- URL metadata extraction (OG/Twitter meta, oEmbed fallback)
- Image caching in Postgres with 480px thumbnails
- Multi-tag filtering with Ctrl/Cmd for OR mode
- Fuzzy tag suggestions and inline tag editing
- Browser console auth() with first-use password setup
- Brutalist UI with Commit Mono font and Pico CSS
- Light/dark mode via browser preference

internal/static/static.go

@@ -0,0 +1,42 @@
+package static
+
+import (
+	"crypto/sha256"
+	"embed"
+	"encoding/hex"
+	"net/http"
+	"strings"
+	"time"
+)
+
+//go:embed css/* js/* fonts/*
+var staticFS embed.FS
+
+// Version is set via -ldflags in production
+var Version string
+
+func init() {
+	if Version == "" {
+		h := sha256.Sum256([]byte(time.Now().String()))
+		Version = hex.EncodeToString(h[:4])
+	}
+}
+
+func VersionedPath(path string) string {
+	return "/static/" + Version + "/" + path
+}
+
+func Handler() http.Handler {
+	fileServer := http.FileServer(http.FS(staticFS))
+	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		path := r.URL.Path
+		path = strings.TrimPrefix(path, "/static/")
+		if idx := strings.Index(path, "/"); idx != -1 {
+			path = path[idx+1:]
+		}
+		r.URL.Path = "/" + path
+
+		w.Header().Set("Cache-Control", "public, max-age=31536000, immutable")
+		fileServer.ServeHTTP(w, r)
+	})
+}