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/deepmerge/package.json

@@ -0,0 +1,42 @@
+{
+  "name": "deepmerge",
+  "description": "A library for deep (recursive) merging of Javascript objects",
+  "keywords": [
+    "merge",
+    "deep",
+    "extend",
+    "copy",
+    "clone",
+    "recursive"
+  ],
+  "version": "4.3.1",
+  "homepage": "https://github.com/TehShrike/deepmerge",
+  "repository": {
+    "type": "git",
+    "url": "git://github.com/TehShrike/deepmerge.git"
+  },
+  "main": "dist/cjs.js",
+  "engines": {
+    "node": ">=0.10.0"
+  },
+  "scripts": {
+    "build": "rollup -c",
+    "test": "npm run build && tape test/*.js && jsmd readme.md && npm run test:typescript",
+    "test:typescript": "tsc --noEmit test/typescript.ts && ts-node test/typescript.ts",
+    "size": "npm run build && uglifyjs --compress --mangle -- ./dist/umd.js | gzip -c | wc -c"
+  },
+  "devDependencies": {
+    "@types/node": "^8.10.54",
+    "is-mergeable-object": "1.1.0",
+    "is-plain-object": "^5.0.0",
+    "jsmd": "^1.0.2",
+    "rollup": "^1.23.1",
+    "rollup-plugin-commonjs": "^10.1.0",
+    "rollup-plugin-node-resolve": "^5.2.0",
+    "tape": "^4.11.0",
+    "ts-node": "7.0.1",
+    "typescript": "=2.2.2",
+    "uglify-js": "^3.6.1"
+  },
+  "license": "MIT"
+}