fix(upload): 分片上传 - 先预留配额并原子提交容量 (#679)

Co-authored-by: ddcat666 <26564566+ddcat666@users.noreply.github.com>

backend/internal/database/migrations.go

@@ -146,6 +146,9 @@ var schemaMigrations = []migration{
 	{version: 43, name: "topup_sale_strategies", checksum: "sha256:topup-sale-strategies-v43-20260929", apply: func(tx *gorm.DB) error {
 		return tx.AutoMigrate(&model.TopupProduct{}, &model.PaymentOrder{})
 	}},
+	{version: 45, name: "upload_reservations", checksum: "sha256:upload-reservations-v45-20261005", apply: func(tx *gorm.DB) error {
+		return tx.AutoMigrate(&model.UploadReservation{})
+	}},
 	{version: 46, name: "skill_curation", checksum: "sha256:skill-curation-v46-20261005", apply: migrateSkillCuration},
 	{version: 47, name: "skill_curation_roots", checksum: "sha256:skill-curation-roots-v47-20261005", apply: migrateSkillCurationRoots},
 }

backend/internal/database/migrations_test.go

@@ -36,6 +36,9 @@ func TestMigrateSchemaRecordsAndValidatesVersion(t *testing.T) {
 	if !status.Ready || status.Current != CurrentSchemaVersion {
 		t.Fatalf("unexpected schema status: %#v", status)
 	}
+	if !db.Migrator().HasTable(&model.UploadReservation{}) {
+		t.Fatal("upload reservation migration missing")
+	}
 	if !db.Migrator().HasIndex(&schemaMigration{}, "idx_schema_migrations_applied_at") {
 		t.Fatal("schema migration v2 did not create the applied_at index")
 	}

backend/internal/database/schema.go

@@ -17,6 +17,7 @@ import (
 func Models() []any {
 	return []any{
 		&model.CloudAgentExecution{},
+		&model.UploadReservation{},
 		&model.CloudAgentPiSession{},
 		&model.CloudAgentEventRecord{},
 		&model.CloudAgentMessageRecord{},