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/handlers/image.go

@@ -0,0 +1,32 @@
+package handlers
+
+import (
+	"fmt"
+	"net/http"
+
+	"git.soup.land/soup/lookbook/internal/data/image"
+)
+
+func HandleGetImage(rc *RequestContext, w http.ResponseWriter, r *http.Request) error {
+	id, err := parseID(r.PathValue("id"))
+	if err != nil {
+		http.Error(w, "Invalid ID", http.StatusBadRequest)
+		return nil
+	}
+
+	row, err := image.QFindByID(r.Context(), rc.DB, id)
+	if err != nil {
+		return fmt.Errorf("find image: %w", err)
+	}
+	if row == nil {
+		http.NotFound(w, r)
+		return nil
+	}
+
+	if row.ContentType != "" {
+		w.Header().Set("Content-Type", row.ContentType)
+	}
+	w.Header().Set("Cache-Control", "public, max-age=604800")
+	_, _ = w.Write(row.Bytes)
+	return nil
+}