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/pathval/package.json

@@ -0,0 +1,64 @@
+{
+  "name": "pathval",
+  "description": "Object value retrieval given a string path",
+  "homepage": "https://github.com/chaijs/pathval",
+  "version": "2.0.1",
+  "keywords": [
+    "pathval",
+    "value retrieval",
+    "chai util"
+  ],
+  "license": "MIT",
+  "author": "Veselin Todorov <hi@vesln.com>",
+  "files": [
+    "index.js"
+  ],
+  "main": "./index.js",
+  "type": "module",
+  "repository": {
+    "type": "git",
+    "url": "git+ssh://git@github.com/chaijs/pathval.git"
+  },
+  "scripts": {
+    "lint": "eslint --ignore-path .gitignore .",
+    "lint:fix": "npm run lint -- --fix",
+    "semantic-release": "semantic-release pre && npm publish && semantic-release post",
+    "pretest": "npm run lint",
+    "test": "npm run test:node && npm run test:browser",
+    "test:browser": "web-test-runner test/index.js --node-resolve",
+    "test:node": "mocha",
+    "prepare": "husky"
+  },
+  "eslintConfig": {
+    "extends": [
+      "strict/es6"
+    ],
+    "parserOptions": {
+      "sourceType": "module"
+    },
+    "env": {
+      "es6": true
+    },
+    "globals": {
+      "HTMLElement": false
+    },
+    "rules": {
+      "complexity": 0,
+      "max-statements": 0
+    }
+  },
+  "devDependencies": {
+    "@web/test-runner": "^0.17.0",
+    "eslint": "^7.13.0",
+    "eslint-config-strict": "^14.0.1",
+    "eslint-plugin-filenames": "^1.3.2",
+    "husky": "^9.1.7",
+    "mocha": "^8.2.1",
+    "semantic-release": "^17.2.2",
+    "simple-assert": "^2.0.0",
+    "validate-commit-msg": "^2.14.0"
+  },
+  "engines": {
+    "node": ">= 14.16"
+  }
+}