Initial commit: Lookbook personal collection app

Pinterest-like app for saving images, videos, quotes, and embeds.

Features:
- Go backend with PostgreSQL, SSR templates
- Console-based admin auth (login/logout via browser console)
- Item types: images, videos (ffmpeg transcoding), quotes, embeds
- Media stored as BLOBs in PostgreSQL
- OpenGraph metadata extraction for links
- Embed detection for YouTube, Vimeo, Twitter/X
- Masonry grid layout, item detail pages
- Tag system with filtering
- Refresh metadata endpoint with change warnings
- Replace media endpoint for updating item images/videos

internal/handlers/media.go

@@ -0,0 +1,50 @@
+package handlers
+
+import (
+	"context"
+	"fmt"
+	"net/http"
+	"strconv"
+	"time"
+
+	"lookbook/internal/data/media"
+)
+
+// HandleGetMedia handles GET /media/{id}
+func HandleGetMedia(rc *RequestContext, w http.ResponseWriter, r *http.Request) error {
+	idStr := r.PathValue("id")
+	id, err := strconv.ParseInt(idStr, 10, 64)
+	if err != nil {
+		http.Error(w, "invalid id", http.StatusBadRequest)
+		return nil
+	}
+
+	ctx, cancel := context.WithTimeout(r.Context(), 30*time.Second)
+	defer cancel()
+
+	m, err := media.QFindByID(ctx, rc.DB, id)
+	if err != nil {
+		return err
+	}
+	if m == nil {
+		http.NotFound(w, r)
+		return nil
+	}
+
+	// Set caching headers (media is immutable)
+	w.Header().Set("Cache-Control", "public, max-age=31536000, immutable")
+	w.Header().Set("Content-Type", m.ContentType)
+	w.Header().Set("Content-Length", strconv.Itoa(len(m.Data)))
+
+	// Add ETag for conditional requests
+	etag := fmt.Sprintf(`"%d"`, m.ID)
+	w.Header().Set("ETag", etag)
+
+	if r.Header.Get("If-None-Match") == etag {
+		w.WriteHeader(http.StatusNotModified)
+		return nil
+	}
+
+	w.Write(m.Data)
+	return nil
+}