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/nanoid/bin/nanoid.cjs

@@ -0,0 +1,55 @@
+#!/usr/bin/env node
+
+let { nanoid, customAlphabet } = require('..')
+
+function print(msg) {
+  process.stdout.write(msg + '\n')
+}
+
+function error(msg) {
+  process.stderr.write(msg + '\n')
+  process.exit(1)
+}
+
+if (process.argv.includes('--help') || process.argv.includes('-h')) {
+  print(`
+  Usage
+    $ nanoid [options]
+
+  Options
+    -s, --size       Generated ID size
+    -a, --alphabet   Alphabet to use
+    -h, --help       Show this help
+
+  Examples
+    $ nanoid --s 15
+    S9sBF77U6sDB8Yg
+
+    $ nanoid --size 10 --alphabet abc
+    bcabababca`)
+  process.exit()
+}
+
+let alphabet, size
+for (let i = 2; i < process.argv.length; i++) {
+  let arg = process.argv[i]
+  if (arg === '--size' || arg === '-s') {
+    size = Number(process.argv[i + 1])
+    i += 1
+    if (Number.isNaN(size) || size <= 0) {
+      error('Size must be positive integer')
+    }
+  } else if (arg === '--alphabet' || arg === '-a') {
+    alphabet = process.argv[i + 1]
+    i += 1
+  } else {
+    error('Unknown argument ' + arg)
+  }
+}
+
+if (alphabet) {
+  let customNanoid = customAlphabet(alphabet, size)
+  print(customNanoid())
+} else {
+  print(nanoid(size))
+}