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/index.d.cts

@@ -0,0 +1,91 @@
+/**
+ * Generate secure URL-friendly unique ID.
+ *
+ * By default, the ID will have 21 symbols to have a collision probability
+ * similar to UUID v4.
+ *
+ * ```js
+ * import { nanoid } from 'nanoid'
+ * model.id = nanoid() //=> "Uakgb_J5m9g-0JDMbcJqL"
+ * ```
+ *
+ * @param size Size of the ID. The default size is 21.
+ * @returns A random string.
+ */
+export function nanoid(size?: number): string
+
+/**
+ * Generate secure unique ID with custom alphabet.
+ *
+ * Alphabet must contain 256 symbols or less. Otherwise, the generator
+ * will not be secure.
+ *
+ * @param alphabet Alphabet used to generate the ID.
+ * @param defaultSize Size of the ID. The default size is 21.
+ * @returns A random string generator.
+ *
+ * ```js
+ * const { customAlphabet } = require('nanoid')
+ * const nanoid = customAlphabet('0123456789абвгдеё', 5)
+ * nanoid() //=> "8ё56а"
+ * ```
+ */
+export function customAlphabet(
+  alphabet: string,
+  defaultSize?: number
+): (size?: number) => string
+
+/**
+ * Generate unique ID with custom random generator and alphabet.
+ *
+ * Alphabet must contain 256 symbols or less. Otherwise, the generator
+ * will not be secure.
+ *
+ * ```js
+ * import { customRandom } from 'nanoid/format'
+ *
+ * const nanoid = customRandom('abcdef', 5, size => {
+ *   const random = []
+ *   for (let i = 0; i < size; i++) {
+ *     random.push(randomByte())
+ *   }
+ *   return random
+ * })
+ *
+ * nanoid() //=> "fbaef"
+ * ```
+ *
+ * @param alphabet Alphabet used to generate a random string.
+ * @param size Size of the random string.
+ * @param random A random bytes generator.
+ * @returns A random string generator.
+ */
+export function customRandom(
+  alphabet: string,
+  size: number,
+  random: (bytes: number) => Uint8Array
+): () => string
+
+/**
+ * URL safe symbols.
+ *
+ * ```js
+ * import { urlAlphabet } from 'nanoid'
+ * const nanoid = customAlphabet(urlAlphabet, 10)
+ * nanoid() //=> "Uakgb_J5m9"
+ * ```
+ */
+export const urlAlphabet: string
+
+/**
+ * Generate an array of random bytes collected from hardware noise.
+ *
+ * ```js
+ * import { customRandom, random } from 'nanoid'
+ * const nanoid = customRandom("abcdef", 5, random)
+ * ```
+ *
+ * @param bytes Size of the array.
+ * @returns An array of random bytes.
+ */
+export function random(bytes: number): Uint8Array