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/ajv/lib/data.js

@@ -0,0 +1,49 @@
+'use strict';
+
+var KEYWORDS = [
+  'multipleOf',
+  'maximum',
+  'exclusiveMaximum',
+  'minimum',
+  'exclusiveMinimum',
+  'maxLength',
+  'minLength',
+  'pattern',
+  'additionalItems',
+  'maxItems',
+  'minItems',
+  'uniqueItems',
+  'maxProperties',
+  'minProperties',
+  'required',
+  'additionalProperties',
+  'enum',
+  'format',
+  'const'
+];
+
+module.exports = function (metaSchema, keywordsJsonPointers) {
+  for (var i=0; i<keywordsJsonPointers.length; i++) {
+    metaSchema = JSON.parse(JSON.stringify(metaSchema));
+    var segments = keywordsJsonPointers[i].split('/');
+    var keywords = metaSchema;
+    var j;
+    for (j=1; j<segments.length; j++)
+      keywords = keywords[segments[j]];
+
+    for (j=0; j<KEYWORDS.length; j++) {
+      var key = KEYWORDS[j];
+      var schema = keywords[key];
+      if (schema) {
+        keywords[key] = {
+          anyOf: [
+            schema,
+            { $ref: 'https://raw.githubusercontent.com/ajv-validator/ajv/master/lib/refs/data.json#' }
+          ]
+        };
+      }
+    }
+  }
+
+  return metaSchema;
+};