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/data/auth/queries.go

@@ -0,0 +1,45 @@
+package auth
+
+import (
+	"context"
+	"database/sql"
+	"time"
+)
+
+type Row struct {
+	ID           int64
+	PasswordHash []byte
+	CreatedAt    time.Time
+}
+
+func QGet(ctx context.Context, db *sql.DB) (*Row, error) {
+	var row Row
+	err := db.QueryRowContext(ctx, `
+		SELECT id, password_hash, created_at
+		FROM auth
+		ORDER BY id ASC
+		LIMIT 1
+	`).Scan(&row.ID, &row.PasswordHash, &row.CreatedAt)
+	if err == sql.ErrNoRows {
+		return nil, nil
+	}
+	if err != nil {
+		return nil, err
+	}
+	return &row, nil
+}
+
+func QCreate(ctx context.Context, db *sql.DB, hash []byte) (Row, error) {
+	var row Row
+	err := db.QueryRowContext(ctx, `
+		INSERT INTO auth (password_hash)
+		VALUES ($1)
+		RETURNING id, password_hash, created_at
+	`, hash).Scan(&row.ID, &row.PasswordHash, &row.CreatedAt)
+	return row, err
+}
+
+func QUpdate(ctx context.Context, db *sql.DB, id int64, hash []byte) error {
+	_, err := db.ExecContext(ctx, `UPDATE auth SET password_hash = $2 WHERE id = $1`, id, hash)
+	return err
+}