feat(server/devices): users.max_devices_override 单用户设备上限覆盖(NULL走套餐默认)+ 迁移000025

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01P9G7E3wmAYL9KeYCVZVsqu

server/internal/store/codes_lib_migrate_test.go

@@ -104,10 +104,14 @@ func TestCodesLibMigrateRoundTrip(t *testing.T) {
 	// the reviewer's repro hit: the lib's `codes` table collides with the
 	// name 000022's down script renames legacy_codes back to.
 	m := newSQLiteStepper(t, db)
-	// 000024 (invite_rewards) and 000023 (pay_purchases/source-enum) now sit
-	// on top of 000022 (codes_lib_legacy_rename) and are unrelated to this
-	// collision — step them back down first so we land exactly on the
-	// 000022 boundary the test targets.
+	// 000025 (user_device_limit_override), 000024 (invite_rewards) and 000023
+	// (pay_purchases/source-enum) now sit on top of 000022
+	// (codes_lib_legacy_rename) and are unrelated to this collision — step
+	// them back down first so we land exactly on the 000022 boundary the
+	// test targets.
+	if err := m.Steps(-1); err != nil {
+		t.Fatalf("step 000025 down: %v", err)
+	}
 	if err := m.Steps(-1); err != nil {
 		t.Fatalf("step 000024 down: %v", err)
 	}