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/@vincjo/datatables/dist/style.css

@@ -0,0 +1,49 @@
+.svelte-simple-datatable table {
+    border-collapse: separate;
+    border-spacing: 0;
+    width: 100%;
+    background: inherit;
+}
+.svelte-simple-datatable table thead {
+    position: sticky;
+    inset-block-start: 0;
+    background: inherit;
+    z-index: 1;
+}
+.svelte-simple-datatable thead tr {
+    background: inherit;
+}
+.svelte-simple-datatable thead tr th {
+    background: inherit;
+}
+.svelte-simple-datatable thead tr:first-child th {
+    padding: 8px 20px;
+    background: inherit;
+}
+.svelte-simple-datatable tbody {
+    background: inherit;
+}
+.svelte-simple-datatable tbody tr {
+    transition: background, 0.2s;
+    background: inherit;
+}
+.svelte-simple-datatable tbody tr:hover {
+    background: var(--grey-lighten-3, #fafafa);
+}
+.svelte-simple-datatable tbody td {
+    padding: 4px 20px;
+    border-right: 1px solid var(--grey-lighten, #eee);
+    border-bottom: 1px solid var(--grey-lighten, #eee);
+    background: inherit;
+}
+.svelte-simple-datatable tbody td:last-child {
+    border-right: none;
+}
+.svelte-simple-datatable u.highlight {
+    text-decoration: none;
+    background: rgba(251, 192, 45, 0.6);
+    border-radius: 2px;
+}
+.svelte-simple-datatable footer.divider {
+    border-top: 1px solid var(--grey, #e0e0e0);
+}