Fix slug conflict and seed import for Docker deployment

- Rename [id] → [competitionId] under /admin/competitions/ to fix
  Next.js "different slug names for same dynamic path" error
- Update params.id → params.competitionId in competition detail page
- Fix seed import: use .js extension for tsx ESM module resolution

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'
+import { defaultRoundConfig } from '../src/types/competition-configs.js'
 import { readFileSync } from 'fs'
 import { parse } from 'csv-parse/sync'
 import { join, dirname } from 'path'

src/app/(admin)/admin/competitions/[competitionId]/page.tsx

@@ -95,7 +95,7 @@ const roundTypeColors: Record<string, string> = {
 
 export default function CompetitionDetailPage() {
   const params = useParams()
-  const competitionId = params.id as string
+  const competitionId = params.competitionId as string
   const utils = trpc.useUtils()
   const [addRoundOpen, setAddRoundOpen] = useState(false)
   const [roundForm, setRoundForm] = useState({