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/@tailwindcss/node/package.json

@@ -0,0 +1,48 @@
+{
+  "name": "@tailwindcss/node",
+  "version": "4.3.3",
+  "description": "A utility-first CSS framework for rapidly building custom user interfaces.",
+  "license": "MIT",
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/tailwindlabs/tailwindcss.git",
+    "directory": "packages/@tailwindcss-node"
+  },
+  "bugs": "https://github.com/tailwindlabs/tailwindcss/issues",
+  "homepage": "https://tailwindcss.com",
+  "files": [
+    "dist/"
+  ],
+  "publishConfig": {
+    "provenance": true,
+    "access": "public"
+  },
+  "exports": {
+    ".": {
+      "types": "./dist/index.d.ts",
+      "import": "./dist/index.mjs",
+      "require": "./dist/index.js"
+    },
+    "./require-cache": {
+      "types": "./dist/require-cache.d.ts",
+      "default": "./dist/require-cache.js"
+    },
+    "./esm-cache-loader": {
+      "types": "./dist/esm-cache.loader.d.mts",
+      "default": "./dist/esm-cache.loader.mjs"
+    }
+  },
+  "dependencies": {
+    "@jridgewell/remapping": "^2.3.5",
+    "enhanced-resolve": "^5.24.1",
+    "jiti": "^2.7.0",
+    "lightningcss": "1.32.0",
+    "magic-string": "^0.30.21",
+    "source-map-js": "^1.2.1",
+    "tailwindcss": "4.3.3"
+  },
+  "scripts": {
+    "build": "tsup-node",
+    "dev": "pnpm run build -- --watch"
+  }
+}