feat(01-01): add RankingSnapshot model + enums to schema.prisma

- Add RankingTriggerType enum (MANUAL, AUTO, RETROACTIVE, QUICK)
- Add RankingMode enum (PREVIEW, CONFIRMED, QUICK)
- Add RankingSnapshotStatus enum (PENDING, RUNNING, COMPLETED, FAILED)
- Add RankingSnapshot model with roundId/triggeredById FKs, criteria/results JSON fields, AI metadata
- Add Round.rankingSnapshots back-relation (RoundRankingSnapshots)
- Add User.rankingSnapshots back-relation (TriggeredRankingSnapshots)
- Create migration 20260227000000_add_ranking_snapshot
- Regenerate Prisma client (prisma.rankingSnapshot accessible)

prisma/migrations/20260227000000_add_ranking_snapshot/migration.sql

@@ -0,0 +1,45 @@
+-- CreateEnum
+CREATE TYPE "RankingTriggerType" AS ENUM ('MANUAL', 'AUTO', 'RETROACTIVE', 'QUICK');
+
+-- CreateEnum
+CREATE TYPE "RankingMode" AS ENUM ('PREVIEW', 'CONFIRMED', 'QUICK');
+
+-- CreateEnum
+CREATE TYPE "RankingSnapshotStatus" AS ENUM ('PENDING', 'RUNNING', 'COMPLETED', 'FAILED');
+
+-- CreateTable
+CREATE TABLE "RankingSnapshot" (
+    "id" TEXT NOT NULL,
+    "roundId" TEXT NOT NULL,
+    "triggeredById" TEXT,
+    "triggerType" "RankingTriggerType" NOT NULL DEFAULT 'MANUAL',
+    "criteriaText" TEXT NOT NULL,
+    "parsedRulesJson" JSONB NOT NULL,
+    "startupRankingJson" JSONB,
+    "conceptRankingJson" JSONB,
+    "evaluationDataJson" JSONB,
+    "mode" "RankingMode" NOT NULL DEFAULT 'PREVIEW',
+    "status" "RankingSnapshotStatus" NOT NULL DEFAULT 'COMPLETED',
+    "reordersJson" JSONB,
+    "model" TEXT,
+    "tokensUsed" INTEGER NOT NULL DEFAULT 0,
+    "createdAt" TIMESTAMP(3) NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    "updatedAt" TIMESTAMP(3) NOT NULL,
+
+    CONSTRAINT "RankingSnapshot_pkey" PRIMARY KEY ("id")
+);
+
+-- CreateIndex
+CREATE INDEX "RankingSnapshot_roundId_idx" ON "RankingSnapshot"("roundId");
+
+-- CreateIndex
+CREATE INDEX "RankingSnapshot_triggeredById_idx" ON "RankingSnapshot"("triggeredById");
+
+-- CreateIndex
+CREATE INDEX "RankingSnapshot_createdAt_idx" ON "RankingSnapshot"("createdAt");
+
+-- AddForeignKey
+ALTER TABLE "RankingSnapshot" ADD CONSTRAINT "RankingSnapshot_roundId_fkey" FOREIGN KEY ("roundId") REFERENCES "Round"("id") ON DELETE CASCADE ON UPDATE CASCADE;
+
+-- AddForeignKey
+ALTER TABLE "RankingSnapshot" ADD CONSTRAINT "RankingSnapshot_triggeredById_fkey" FOREIGN KEY ("triggeredById") REFERENCES "User"("id") ON DELETE SET NULL ON UPDATE CASCADE;