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/middleware/logger.go

@@ -0,0 +1,44 @@
+package middleware
+
+import (
+	"log/slog"
+	"net/http"
+	"time"
+)
+
+// Logging emits structured request logs.
+func Logging(logger *slog.Logger) func(http.Handler) http.Handler {
+	return func(next http.Handler) http.Handler {
+		return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+			start := time.Now()
+			ww := &responseWriter{ResponseWriter: w, status: http.StatusOK}
+
+			next.ServeHTTP(ww, r)
+
+			logger.LogAttrs(r.Context(), slog.LevelInfo, "request",
+				slog.String("method", r.Method),
+				slog.String("path", r.URL.Path),
+				slog.Int("status", ww.status),
+				slog.Int("bytes", ww.bytes),
+				slog.Duration("latency", time.Since(start)),
+			)
+		})
+	}
+}
+
+type responseWriter struct {
+	http.ResponseWriter
+	status int
+	bytes  int
+}
+
+func (w *responseWriter) WriteHeader(statusCode int) {
+	w.status = statusCode
+	w.ResponseWriter.WriteHeader(statusCode)
+}
+
+func (w *responseWriter) Write(b []byte) (int, error) {
+	n, err := w.ResponseWriter.Write(b)
+	w.bytes += n
+	return n, err
+}