feat: Phase 1 — extract the client (web SPA + desktop) to dtoro/oikos-web

Problem: the hexagonal refactor churns the backend tree for nine more
phases; the UI delivery stack (web/ SPA, cmd/desktop Wails wrapper,
compose/web image) must move to its own repo first so doc/layout
rewrites land once on a backend-only tree.

Change:
- New repo git.hubris.network/dtoro/oikos-web (v0.33.0): web/, desktop/
  (updateURL repointed to oikos-web releases), compose/, own CI (web +
  desktop jobs), own deploy script (CI-green gate, TOCTOU guard,
  version-tagged images, prune-to-3), own webhook receiver on :9798 +
  launchd unit, own compose project publishing the same 8091:80.
- Cutover executed on mac-mini in order: oikos stack's web service
  stopped+removed, oikos-web project brought up on 8091; outer Caddy
  untouched (targets the published port) — serving + Authentik flow +
  /wails 404 quirk verified post-cutover.
- Stripped from oikos: web/, cmd/desktop/, compose/web/, desktop CI
  workflow, ci.yml web job, Makefile ui/desktop/desktop-package/install
  targets, the compose web service, oikos-web from deploy.sh's fallback
  prune list; wails + go-keyring dropped from go.mod, vendor synced.
- README / CONTRIBUTING / AGENTS.md / .agents dev+operations docs now
  point at the new repo; mbse + mascot design docs carry a path note.

Risk: production SPA serving depends on the new pipeline now; rollback
is versioned-image re-up of the old web service from a pre-split
checkout (port 8091). Desktop builds installed before the split still
check dtoro/oikos releases — one manual reinstall, noted in the
oikos-web release notes.

Verification: go vet, make test (race), make generate-check, golangci
(no new findings; baseline down 400→365); post-cutover curls —
localhost:8091 200, /wails/runtime.js 404, outer Caddy 302 Authentik.

web/node_modules/@internationalized/date/src/createCalendar.ts

@@ -0,0 +1,63 @@
+/*
+ * Copyright 2020 Adobe. All rights reserved.
+ * This file is licensed to you under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License. You may obtain a copy
+ * of the License at http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software distributed under
+ * the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR REPRESENTATIONS
+ * OF ANY KIND, either express or implied. See the License for the specific language
+ * governing permissions and limitations under the License.
+ */
+
+import {BuddhistCalendar} from './calendars/BuddhistCalendar';
+import {Calendar, CalendarIdentifier} from './types';
+import {
+  CopticCalendar,
+  EthiopicAmeteAlemCalendar,
+  EthiopicCalendar
+} from './calendars/EthiopicCalendar';
+import {GregorianCalendar} from './calendars/GregorianCalendar';
+import {HebrewCalendar} from './calendars/HebrewCalendar';
+import {IndianCalendar} from './calendars/IndianCalendar';
+import {
+  IslamicCivilCalendar,
+  IslamicTabularCalendar,
+  IslamicUmalquraCalendar
+} from './calendars/IslamicCalendar';
+import {JapaneseCalendar} from './calendars/JapaneseCalendar';
+import {PersianCalendar} from './calendars/PersianCalendar';
+import {TaiwanCalendar} from './calendars/TaiwanCalendar';
+
+/** Creates a `Calendar` instance from a Unicode calendar identifier string. */
+export function createCalendar(name: CalendarIdentifier): Calendar {
+  switch (name) {
+    case 'buddhist':
+      return new BuddhistCalendar();
+    case 'ethiopic':
+      return new EthiopicCalendar();
+    case 'ethioaa':
+      return new EthiopicAmeteAlemCalendar();
+    case 'coptic':
+      return new CopticCalendar();
+    case 'hebrew':
+      return new HebrewCalendar();
+    case 'indian':
+      return new IndianCalendar();
+    case 'islamic-civil':
+      return new IslamicCivilCalendar();
+    case 'islamic-tbla':
+      return new IslamicTabularCalendar();
+    case 'islamic-umalqura':
+      return new IslamicUmalquraCalendar();
+    case 'japanese':
+      return new JapaneseCalendar();
+    case 'persian':
+      return new PersianCalendar();
+    case 'roc':
+      return new TaiwanCalendar();
+    case 'gregory':
+    default:
+      return new GregorianCalendar();
+  }
+}