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/package.json

@@ -0,0 +1,88 @@
+{
+  "name": "postcss",
+  "version": "8.5.25",
+  "description": "Tool for transforming styles with JS plugins",
+  "keywords": [
+    "css",
+    "manipulation",
+    "parser",
+    "postcss",
+    "preprocessor",
+    "rework",
+    "source map",
+    "transform",
+    "transpiler"
+  ],
+  "homepage": "https://postcss.org/",
+  "bugs": {
+    "url": "https://github.com/postcss/postcss/issues"
+  },
+  "license": "MIT",
+  "author": "Andrey Sitnik <andrey@sitnik.es>",
+  "repository": "postcss/postcss",
+  "funding": [
+    {
+      "type": "opencollective",
+      "url": "https://opencollective.com/postcss/"
+    },
+    {
+      "type": "tidelift",
+      "url": "https://tidelift.com/funding/github/npm/postcss"
+    },
+    {
+      "type": "github",
+      "url": "https://github.com/sponsors/ai"
+    }
+  ],
+  "main": "./lib/postcss.js",
+  "browser": {
+    "./lib/terminal-highlight": false,
+    "source-map-js": false,
+    "path": false,
+    "url": false,
+    "fs": false
+  },
+  "types": "./lib/postcss.d.ts",
+  "exports": {
+    ".": {
+      "import": "./lib/postcss.mjs",
+      "require": "./lib/postcss.js"
+    },
+    "./lib/at-rule": "./lib/at-rule.js",
+    "./lib/comment": "./lib/comment.js",
+    "./lib/container": "./lib/container.js",
+    "./lib/css-syntax-error": "./lib/css-syntax-error.js",
+    "./lib/declaration": "./lib/declaration.js",
+    "./lib/fromJSON": "./lib/fromJSON.js",
+    "./lib/input": "./lib/input.js",
+    "./lib/lazy-result": "./lib/lazy-result.js",
+    "./lib/no-work-result": "./lib/no-work-result.js",
+    "./lib/list": "./lib/list.js",
+    "./lib/map-generator": "./lib/map-generator.js",
+    "./lib/node": "./lib/node.js",
+    "./lib/parse": "./lib/parse.js",
+    "./lib/parser": "./lib/parser.js",
+    "./lib/postcss": "./lib/postcss.js",
+    "./lib/previous-map": "./lib/previous-map.js",
+    "./lib/processor": "./lib/processor.js",
+    "./lib/result": "./lib/result.js",
+    "./lib/root": "./lib/root.js",
+    "./lib/rule": "./lib/rule.js",
+    "./lib/stringifier": "./lib/stringifier.js",
+    "./lib/stringify": "./lib/stringify.js",
+    "./lib/symbols": "./lib/symbols.js",
+    "./lib/terminal-highlight": "./lib/terminal-highlight.js",
+    "./lib/tokenize": "./lib/tokenize.js",
+    "./lib/warn-once": "./lib/warn-once.js",
+    "./lib/warning": "./lib/warning.js",
+    "./package.json": "./package.json"
+  },
+  "dependencies": {
+    "nanoid": "^3.3.16",
+    "picocolors": "^1.1.1",
+    "source-map-js": "^1.2.1"
+  },
+  "engines": {
+    "node": "^10 || ^12 || >=14"
+  }
+}