fix(orders): delete NAS folder when order delete modal's checkbox is ticked

The order delete modal sends { delete_files }, but the route ignored the
body and deleteOrder never touched the NAS — so the project folder of an
order-spawned project always stayed on the share (the only way to delete
such a project is via its order, since deleteProject blocks order-linked
projects). Project delete (standalone projects) already worked.

- orders route: read delete_files from the body, pass to deleteOrder.
- orders.service deleteOrder(id, deleteFiles): select project_number and,
  after the DB transaction commits, best-effort deleteProjectFolder for
  each linked project when the flag is set. Non-fatal; idempotent.
- tests: NasFileManager.deleteProjectFolder coverage — removes by number
  prefix, no-op when absent, false when not mounted (158 -> 161 tests).

Bump version to 2.0.4.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

src/__tests__/nas-project-folder.test.ts

@@ -68,3 +68,39 @@ describe("NasFileManager.createProjectFolder", () => {
     );
   });
 });
+
+/**
+ * Folder deletion primitive used by the "delete folder" checkbox on both the
+ * order delete (orders.service deleteOrder) and project delete (projects.service
+ * deleteProject) paths. Matches the project by number prefix.
+ */
+describe("NasFileManager.deleteProjectFolder", () => {
+  let tmpBase: string;
+  let nas: NasFileManager;
+
+  beforeEach(() => {
+    tmpBase = fs.mkdtempSync(path.join(os.tmpdir(), "nas-del-"));
+    nas = new NasFileManager(tmpBase);
+  });
+
+  afterEach(() => {
+    fs.rmSync(tmpBase, { recursive: true, force: true });
+  });
+
+  it("removes an existing project folder (matched by number prefix)", async () => {
+    nas.createProjectFolder("26710010", "Hala");
+    expect(fs.existsSync(path.join(tmpBase, "26710010_Hala"))).toBe(true);
+    const ok = await nas.deleteProjectFolder("26710010");
+    expect(ok).toBe(true);
+    expect(fs.existsSync(path.join(tmpBase, "26710010_Hala"))).toBe(false);
+  });
+
+  it("is a no-op (returns true) when no folder exists for the number", async () => {
+    expect(await nas.deleteProjectFolder("26710011")).toBe(true);
+  });
+
+  it("returns false when the NAS base is not mounted", async () => {
+    const missing = new NasFileManager(path.join(tmpBase, "nope"));
+    expect(await missing.deleteProjectFolder("26710012")).toBe(false);
+  });
+});