fix: resolve Railway deployment failures

- Fix ghost DROP COLUMN in migration (previousData/previousFilingStatus were
  added via db push, never via migration - use IF EXISTS for safety)
- Fix duplicate cellType declaration in K1ImportFieldDto

libs/common/src/lib/dtos/k1-import.dto.ts

@@ -66,10 +66,6 @@ export class K1ExtractedFieldDto {
   @IsOptional()
   @IsBoolean()
   isCheckbox?: boolean;
-
-  @IsOptional()
-  @IsString()
-  cellType?: string;
 }
 
 export class K1UnmappedItemDto {

prisma/migrations/20260321004726_add_k1_normalized_model/migration.sql

@@ -1,10 +1,10 @@
 -- AlterTable
 ALTER TABLE "K1ImportSession" DROP COLUMN "verifiedData";
 
--- AlterTable
-ALTER TABLE "KDocument" DROP COLUMN "previousData",
-DROP COLUMN "previousFilingStatus",
-ALTER COLUMN "data" DROP NOT NULL;
+-- AlterTable (use IF EXISTS for columns that may have been added via db push)
+ALTER TABLE "KDocument" DROP COLUMN IF EXISTS "previousData";
+ALTER TABLE "KDocument" DROP COLUMN IF EXISTS "previousFilingStatus";
+ALTER TABLE "KDocument" ALTER COLUMN "data" DROP NOT NULL;
 
 -- CreateTable
 CREATE TABLE "k1_box_definition" (