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

Makefile

@@ -0,0 +1,26 @@
+APP := ./cmd/server
+VERSION := $(shell git rev-parse --short HEAD 2>/dev/null || echo "dev")
+LDFLAGS := -X lookbook/internal/static.Version=$(VERSION)
+
+.PHONY: dev run migrate rollback fmt test build
+
+dev:
+	hivemind
+
+run:
+	go run $(APP) web
+
+migrate:
+	go run $(APP) -migrate
+
+rollback:
+	go run $(APP) -rollback
+
+fmt:
+	go fmt ./...
+
+test:
+	go test -v ./...
+
+build:
+	CGO_ENABLED=0 go build -ldflags "$(LDFLAGS)" -o bin/lookbook $(APP)