Add SpacetimeDB conflict migration flow

scripts/spacetime-import-migration-json.mjs

@@ -40,6 +40,7 @@ try {
     `[spacetime:migration:import] ${options.dryRun ? 'dry-run 完成' : '导入完成'}: ${inPath}`,
   );
   printTableStats(result.table_stats);
+  printMigrationWarnings(result.warnings);
 } catch (error) {
   console.error(
     `[spacetime:migration:import] ${error instanceof Error ? error.message : String(error)}`,
@@ -177,3 +178,18 @@ function printTableStats(tableStats) {
   }));
   console.table(rows);
 }
+
+function printMigrationWarnings(warnings) {
+  if (!Array.isArray(warnings) || warnings.length === 0) {
+    return;
+  }
+
+  console.warn('[spacetime:migration:import] 迁移告警汇总:');
+  console.table(
+    warnings.map((warning) => ({
+      table: warning.table_name,
+      kind: warning.warning_kind,
+      message: warning.message,
+    })),
+  );
+}