Add Democratic fundraising platform.

Co-authored-by: Cursor <cursoragent@cursor.com>

prisma/migrations/20260510210000_guest_donations/migration.sql

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+-- AlterTable: guest donations + optional donor contact (CRM / disclosure tooling)
+ALTER TABLE "Donation" DROP CONSTRAINT IF EXISTS "Donation_userId_fkey";
+
+ALTER TABLE "Donation" ALTER COLUMN "userId" DROP NOT NULL;
+
+ALTER TABLE "Donation" ADD COLUMN "donorEmail" TEXT;
+ALTER TABLE "Donation" ADD COLUMN "donorName" TEXT;
+
+ALTER TABLE "Donation" ADD CONSTRAINT "Donation_userId_fkey" FOREIGN KEY ("userId") REFERENCES "User"("id") ON DELETE CASCADE ON UPDATE CASCADE;