feat(S2-a): ingest durable app MQTT points securely

backend/prisma/migrations/20260821000000_app_ingest_idempotency/migration.sql

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+-- App-path ingest idempotency + provenance (Sprint 2, S2-a; SRS-SYN-2/7, §3.4.2).
+-- Adds the UUIDv7 idempotency key and forward-compat provenance tags to locate_points.
+
+-- CreateEnum
+CREATE TYPE "PointOrigin" AS ENUM ('APP', 'LOCATOR', 'MAGLINK');
+
+-- CreateEnum
+CREATE TYPE "PointUploadPath" AS ENUM ('APP_MQTT', 'DEVICE_MQTT', 'REST_BATCH');
+
+-- AlterTable
+ALTER TABLE "locate_points" ADD COLUMN     "pointId" TEXT,
+ADD COLUMN     "origin" "PointOrigin" NOT NULL DEFAULT 'LOCATOR',
+ADD COLUMN     "uploadPath" "PointUploadPath",
+ADD COLUMN     "originClientId" TEXT,
+ADD COLUMN     "createdAt" TIMESTAMPTZ(6);
+
+-- CreateIndex
+CREATE UNIQUE INDEX "locate_points_pointId_key" ON "locate_points"("pointId");
+
+-- CreateIndex
+CREATE INDEX "locate_points_jobId_createdAt_idx" ON "locate_points"("jobId", "createdAt");