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/fish.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": "M6.5 12c.94-3.46 4.94-6 8.5-6 3.56 0 6.06 2.54 7 6-.94 3.47-3.44 6-7 6s-7.56-2.53-8.5-6Z" }], ["path", { "d": "M18 12v.5" }], ["path", { "d": "M16 17.93a9.77 9.77 0 0 1 0-11.86" }], ["path", { "d": "M7 10.67C7 8 5.58 5.97 2.73 5.5c-1 1.5-1 5 .23 6.5-1.24 1.5-1.24 5-.23 6.5C5.58 18.03 7 16 7 13.33" }], ["path", { "d": "M10.46 7.26C10.2 5.88 9.17 4.24 8 3h5.8a2 2 0 0 1 1.98 1.67l.23 1.4" }], ["path", { "d": "m16.01 17.93-.23 1.4A2 2 0 0 1 13.8 21H9.5a5.96 5.96 0 0 0 1.49-3.98" }]];
+</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/fish
+@see https://lucide.dev/guide/packages/lucide-svelte - Documentation
+-->
+
+<Icon name="fish" {...props} iconNode={iconNode} />