feat(smarts3-server): Introduce native custom S3 server implementation (Smarts3Server) with routing, middleware, context, filesystem store, controllers and XML utilities; add SmartXml and AWS SDK test; keep optional legacy s3rver backend.

ts/controllers/service.controller.ts

@@ -0,0 +1,35 @@
+import * as plugins from '../plugins.js';
+import type { S3Context } from '../classes/context.js';
+
+/**
+ * Service-level operations (root /)
+ */
+export class ServiceController {
+  /**
+   * GET / - List all buckets
+   */
+  public static async listBuckets(
+    req: plugins.http.IncomingMessage,
+    res: plugins.http.ServerResponse,
+    ctx: S3Context,
+    params: Record<string, string>
+  ): Promise<void> {
+    const buckets = await ctx.store.listBuckets();
+
+    await ctx.sendXML({
+      ListAllMyBucketsResult: {
+        '@_xmlns': 'http://s3.amazonaws.com/doc/2006-03-01/',
+        Owner: {
+          ID: '123456789000',
+          DisplayName: 'S3rver',
+        },
+        Buckets: {
+          Bucket: buckets.map((bucket) => ({
+            Name: bucket.name,
+            CreationDate: bucket.creationDate.toISOString(),
+          })),
+        },
+      },
+    });
+  }
+}