Fix seed import: remove .js extension from competition-configs import

The .js extension caused ERR_MODULE_NOT_FOUND in Docker when tsx
tried to resolve the TypeScript source file.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

prisma/seed.ts

@@ -18,7 +18,7 @@ import {
   AdvancementRuleType,
 } from '@prisma/client'
 import bcrypt from 'bcryptjs'
-import { defaultRoundConfig } from '../src/types/competition-configs.js'
+import { defaultRoundConfig } from '../src/types/competition-configs'
 import { readFileSync } from 'fs'
 import { parse } from 'csv-parse/sync'
 import { join, dirname } from 'path'