feat: add tbank tokens

prisma/migrations/20260813145440_add_tbank_connection/migration.sql

@@ -0,0 +1,10 @@
+-- CreateTable
+CREATE TABLE "TbankConnection" (
+    "userId" TEXT NOT NULL,
+    "encryptedToken" TEXT NOT NULL,
+    "connectedAt" DATETIME NOT NULL,
+    CONSTRAINT "TbankConnection_userId_fkey" FOREIGN KEY ("userId") REFERENCES "User" ("id") ON DELETE CASCADE ON UPDATE CASCADE
+);
+
+-- CreateIndex
+CREATE UNIQUE INDEX "TbankConnection_userId_key" ON "TbankConnection"("userId");