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/README.md

@@ -0,0 +1,36 @@
+# Nano ID
+
+<img src="https://ai.github.io/nanoid/logo.svg" align="right"
+     alt="Nano ID logo by Anton Lovchikov" width="180" height="94">
+
+**English** | [Русский](./README.ru.md) | [简体中文](./README.zh-CN.md) | [Bahasa Indonesia](./README.id-ID.md)
+
+A tiny, secure, URL-friendly, unique string ID generator for JavaScript.
+
+> “An amazing level of senseless perfectionism,
+> which is simply impossible not to respect.”
+
+* **Small.** 130 bytes (minified and gzipped). No dependencies.
+  [Size Limit] controls the size.
+* **Fast.** It is 2 times faster than UUID.
+* **Safe.** It uses hardware random generator. Can be used in clusters.
+* **Short IDs.** It uses a larger alphabet than UUID (`A-Za-z0-9_-`).
+  So ID size was reduced from 36 to 21 symbols.
+* **Portable.** Nano ID was ported
+  to [20 programming languages](#other-programming-languages).
+
+```js
+import { nanoid } from 'nanoid'
+model.id = nanoid() //=> "V1StGXR8_Z5jdHi6B-myT"
+```
+
+Supports modern browsers, IE [with Babel], Node.js and React Native.
+
+[online tool]: https://gitpod.io/#https://github.com/ai/nanoid/
+[with Babel]:  https://developer.epages.com/blog/coding/how-to-transpile-node-modules-with-babel-and-webpack-in-a-monorepo/
+[Size Limit]:  https://github.com/ai/size-limit
+
+<a href="https://evilmartians.com/?utm_source=nanoid">
+  <img src="https://evilmartians.com/badges/sponsored-by-evil-martians.svg"
+       alt="Sponsored by Evil Martians" width="236" height="54">
+</a>