refactor: replace admin bootstrap script with first-run setup

package.json

@@ -6,7 +6,6 @@
 	"scripts": {
 		"dev": "vite dev",
 		"build": "wrangler types --check && vite build",
-		"preview": "wrangler dev .svelte-kit/cloudflare/_worker.js --port 4173",
 		"prepare": "svelte-kit sync || echo ''",
 		"check": "wrangler types --check && svelte-kit sync && svelte-check --tsconfig ./tsconfig.json",
 		"check:watch": "svelte-kit sync && svelte-check --tsconfig ./tsconfig.json --watch",
@@ -16,9 +15,7 @@
 		"db:push": "drizzle-kit push",
 		"db:generate": "drizzle-kit generate",
 		"db:migrate": "drizzle-kit migrate",
-		"db:studio": "drizzle-kit studio",
-		"auth:schema": "better-auth generate --config src/lib/server/auth.ts --output src/lib/server/db/auth.schema.ts --yes",
-		"admin:create": "sh -c 'db=\"${DATABASE_URL:-$([ -d .wrangler/state/v3/d1 ] && find .wrangler/state/v3/d1 -name \"*.sqlite\" -print -quit)}\"; if [ -z \"$db\" ]; then echo \"No local Wrangler D1 SQLite database found. Start wrangler dev or run a local D1 command first.\" >&2; exit 1; fi; if [ -z \"$DATABASE_URL\" ]; then db=\"file:$db\"; fi; DATABASE_URL=\"$db\" node scripts/create-admin.mjs'"
+		"auth:schema": "better-auth generate --config src/lib/server/auth.ts --output src/lib/server/db/auth.schema.ts --yes"
 	},
 	"devDependencies": {
 		"@better-auth/cli": "~1.4.21",