feat(infra): add web vitals Grafana dashboard and admin audit log migration

- Add Grafana dashboard for web vitals metrics visualization
- Add Prisma migration for admin audit log table

Co-Authored-By: Paperclip <noreply@paperclip.ing>

prisma/migrations/20260410100000_add_admin_audit_log/migration.sql

@@ -0,0 +1,38 @@
+-- CreateEnum
+CREATE TYPE "AdminAction" AS ENUM ('LISTING_APPROVED', 'LISTING_REJECTED', 'LISTING_BULK_APPROVED', 'LISTING_BULK_REJECTED', 'USER_BANNED', 'USER_UNBANNED', 'USER_STATUS_UPDATED', 'KYC_APPROVED', 'KYC_REJECTED', 'SUBSCRIPTION_ADJUSTED');
+
+-- CreateEnum
+CREATE TYPE "AuditTargetType" AS ENUM ('USER', 'LISTING', 'SUBSCRIPTION');
+
+-- CreateTable
+CREATE TABLE "AdminAuditLog" (
+    "id" TEXT NOT NULL,
+    "action" "AdminAction" NOT NULL,
+    "actorId" TEXT NOT NULL,
+    "targetId" TEXT NOT NULL,
+    "targetType" "AuditTargetType" NOT NULL,
+    "metadata" JSONB,
+    "ipAddress" TEXT,
+    "userAgent" TEXT,
+    "createdAt" TIMESTAMP(3) NOT NULL DEFAULT CURRENT_TIMESTAMP,
+
+    CONSTRAINT "AdminAuditLog_pkey" PRIMARY KEY ("id")
+);
+
+-- CreateIndex
+CREATE INDEX "AdminAuditLog_actorId_idx" ON "AdminAuditLog"("actorId");
+
+-- CreateIndex
+CREATE INDEX "AdminAuditLog_targetId_targetType_idx" ON "AdminAuditLog"("targetId", "targetType");
+
+-- CreateIndex
+CREATE INDEX "AdminAuditLog_action_idx" ON "AdminAuditLog"("action");
+
+-- CreateIndex
+CREATE INDEX "AdminAuditLog_createdAt_idx" ON "AdminAuditLog"("createdAt");
+
+-- CreateIndex
+CREATE INDEX "AdminAuditLog_actorId_createdAt_idx" ON "AdminAuditLog"("actorId", "createdAt" DESC);
+
+-- CreateIndex
+CREATE INDEX "AdminAuditLog_action_createdAt_idx" ON "AdminAuditLog"("action", "createdAt" DESC);