Add Democratic fundraising platform.

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

prisma/migrations/20260510200000_add_raffle_ledger_link/migration.sql

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+-- AlterTable
+ALTER TABLE "LedgerEntry" ADD COLUMN "raffleEntryId" TEXT;
+
+-- CreateIndex
+CREATE UNIQUE INDEX "LedgerEntry_raffleEntryId_key" ON "LedgerEntry"("raffleEntryId");
+
+-- AddForeignKey
+ALTER TABLE "LedgerEntry" ADD CONSTRAINT "LedgerEntry_raffleEntryId_fkey" FOREIGN KEY ("raffleEntryId") REFERENCES "RaffleEntry"("id") ON DELETE SET NULL ON UPDATE CASCADE;