Competition/Round architecture: full platform rewrite (Phases 1-9)

Replace Pipeline/Stage system with Competition/Round architecture.
New schema: Competition, Round (7 types), JuryGroup, AssignmentPolicy,
ProjectRoundState, DeliberationSession, ResultLock, SubmissionWindow.
New services: round-engine, round-assignment, deliberation, result-lock,
submission-manager, competition-context, ai-prompt-guard.
Full admin/jury/applicant/mentor UI rewrite. AI prompt hardening with
structured prompts, retry logic, and injection detection. All legacy
pipeline/stage code removed. 4 new migrations + seed aligned.

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

prisma/migrations/20260211120000_add_award_vote_composite_index/migration.sql

@@ -1,2 +1,2 @@
--- CreateIndex
-CREATE INDEX "AwardVote_awardId_userId_idx" ON "AwardVote"("awardId", "userId");
+-- CreateIndex
+CREATE INDEX "AwardVote_awardId_userId_idx" ON "AwardVote"("awardId", "userId");