fix(contribution-service): 修复synced_adoptions.status字段长度

1.0 planting_orders.status是VARCHAR(30)，2.0需要匹配以避免数据截断错误

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

backend/services/contribution-service/prisma/migrations/20260112020000_fix_status_varchar_length/migration.sql

@@ -0,0 +1,4 @@
+-- 修复 synced_adoptions.status 字段长度
+-- 1.0 planting_orders.status 是 VARCHAR(30)，需要匹配
+
+ALTER TABLE "synced_adoptions" ALTER COLUMN "status" TYPE VARCHAR(30);

backend/services/contribution-service/prisma/schema.prisma

@@ -41,7 +41,7 @@ model SyncedAdoption {
   accountSequence    String   @map("account_sequence") @db.VarChar(20)
   treeCount          Int      @map("tree_count")
   adoptionDate       DateTime @map("adoption_date") @db.Date
-  status             String?  @db.VarChar(20)
+  status             String?  @db.VarChar(30) // 与1.0 planting_orders.status保持一致
 
   // 贡献值计算参数（从认种时的配置）
   contributionPerTree Decimal @map("contribution_per_tree") @db.Decimal(20, 10)