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/@lucide/svelte/dist/icons/broccoli.svelte

@@ -0,0 +1,23 @@
+<!--
+@lucide/svelte v1.28.0 - ISC
+
+This source code is licensed under the ISC license.
+See the LICENSE file in the root directory of this source tree.
+-->
+
+
+<script lang="ts">import Icon from '../Icon.svelte';
+let props = $props();
+const iconNode = [["path", { "d": "M10 13a3 3 0 0 1-2.121-5.121" }], ["path", { "d": "M15.606 14.204c-3.5 1.5-5.899 4.503-8.899 7.503A1 1 0 0 1 6 22c-2 0-4-2-4-4a1 1 0 0 1 .293-.707c1.911-1.911 3.823-3.578 5.347-5.441" }], ["path", { "d": "M16.573 14.737A4 4 0 0 1 14 11" }], ["path", { "d": "M7.14 10.907a4 4 0 1 1 2.756-7.43A4 4 0 0 1 16.7 4.48a2 2 0 0 1 2.82 2.82 4 4 0 0 1 1.002 6.805A4 4 0 1 1 13 16" }]];
+</script>
+
+<!--
+@component
+
+Lucide SVG icon component, renders SVG Element with children.
+
+@preview ![img](data:image/svg+xml;base64,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) - https://lucide.dev/icons/broccoli
+@see https://lucide.dev/guide/packages/lucide-svelte - Documentation
+-->
+
+<Icon name="broccoli" {...props} iconNode={iconNode} />