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

shell.nix

@@ -0,0 +1,14 @@
+let
+	sx-nix = import ../sx-nix {};
+	pkgs = sx-nix.pkgs;
+in
+
+pkgs.mkShell {
+	packages = [
+		(sx-nix.go.goToolchainBin { version = "1.25.5"; sha256 = "sha256-npt1XWOzas8wwSqaP8N5JDcUwcbT3XKGHaY38zbrs1s="; })
+		pkgs.postgresql
+		pkgs.entr
+		pkgs.fd
+		pkgs.hivemind
+	];
+}