fix: prevent duplicate Default configs and update openboot avatar URL

- OAuth callbacks now check user has zero configs instead of checking for slug='default'
- Fixes duplicate Default config creation when users already have uploaded configs
- Updated openboot user avatar URL to GitHub org avatar

Author: fullstackjam

migrations/0009_seed_configs.sql

@@ -1,7 +1,7 @@
 -- Seed official openboot user and 20 curated starter configs
 
 INSERT INTO users (id, username, email, avatar_url)
-VALUES ('openboot-official', 'openboot', 'hello@openboot.dev', 'https://github.com/openbootdev.png');
+VALUES ('openboot-official', 'openboot', 'hello@openboot.dev', 'https://avatars.githubusercontent.com/u/258731499?v=4');
 
 -- 1. Frontend - React
 INSERT INTO configs (id, user_id, slug, name, description, base_preset, packages, custom_script, visibility, alias, dotfiles_repo, install_count, featured)

src/routes/api/auth/callback/github/+server.ts

@@ -85,9 +85,9 @@ export const GET: RequestHandler = async ({ url, platform, cookies, request }) =
 		.bind(userId, username, email, githubUser.avatar_url || '')
 		.run();
 
-	const existingConfig = await env.DB.prepare('SELECT id FROM configs WHERE user_id = ? AND slug = ?').bind(userId, 'default').first();
+	const configCount = await env.DB.prepare('SELECT COUNT(*) as count FROM configs WHERE user_id = ?').bind(userId).first<{ count: number }>();
 
-	if (!existingConfig) {
+	if (!configCount || configCount.count === 0) {
 		await env.DB.prepare(
 			`
 			INSERT INTO configs (id, user_id, slug, name, description, base_preset, packages)

src/routes/api/auth/callback/google/+server.ts

@@ -87,9 +87,9 @@ export const GET: RequestHandler = async ({ url, platform, cookies, request }) =
 			.bind(userId, username, googleUser.email, googleUser.picture || '')
 			.run();
 
-		const existingConfig = await env.DB.prepare('SELECT id FROM configs WHERE user_id = ? AND slug = ?').bind(userId, 'default').first();
+		const configCount = await env.DB.prepare('SELECT COUNT(*) as count FROM configs WHERE user_id = ?').bind(userId).first<{ count: number }>();
 
-		if (!existingConfig) {
+		if (!configCount || configCount.count === 0) {
 			await env.DB.prepare(
 				`
 				INSERT INTO configs (id, user_id, slug, name, description, base_preset, packages)