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/postcss-load-config/package.json

@@ -0,0 +1,48 @@
+{
+  "name": "postcss-load-config",
+  "version": "3.1.4",
+  "description": "Autoload Config for PostCSS",
+  "main": "src/index.js",
+  "types": "src/index.d.ts",
+  "files": [
+    "src"
+  ],
+  "engines": {
+    "node": ">= 10"
+  },
+  "funding": {
+    "type": "opencollective",
+    "url": "https://opencollective.com/postcss/"
+  },
+  "dependencies": {
+    "lilconfig": "^2.0.5",
+    "yaml": "^1.10.2"
+  },
+  "peerDependencies": {
+    "postcss": ">=8.0.9",
+    "ts-node": ">=9.0.0"
+  },
+  "peerDependenciesMeta": {
+    "ts-node": {
+      "optional": true
+    },
+    "postcss": {
+      "optional": true
+    }
+  },
+  "keywords": [
+    "postcss",
+    "postcssrc",
+    "postcss.config.js"
+  ],
+  "author": "Michael Ciniawky <michael.ciniawsky@gmail.com>",
+  "contributors": [
+    "Ryan Dunckel",
+    "Mateusz Derks",
+    "Dalton Santos",
+    "Patrick Gilday",
+    "François Wouts"
+  ],
+  "repository": "postcss/postcss-load-config",
+  "license": "MIT"
+}