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/import-fresh/index.js

@@ -0,0 +1,34 @@
+'use strict';
+const path = require('path');
+const resolveFrom = require('resolve-from');
+const parentModule = require('parent-module');
+
+module.exports = moduleId => {
+	if (typeof moduleId !== 'string') {
+		throw new TypeError('Expected a string');
+	}
+
+	const parentPath = parentModule(__filename);
+
+	const cwd = parentPath ? path.dirname(parentPath) : __dirname;
+	const filePath = resolveFrom(cwd, moduleId);
+
+	const oldModule = require.cache[filePath];
+	// Delete itself from module parent
+	if (oldModule && oldModule.parent) {
+		let i = oldModule.parent.children.length;
+
+		while (i--) {
+			if (oldModule.parent.children[i].id === filePath) {
+				oldModule.parent.children.splice(i, 1);
+			}
+		}
+	}
+
+	delete require.cache[filePath]; // Delete module from cache
+
+	const parent = require.cache[parentPath]; // If `filePath` and `parentPath` are the same, cache will already be deleted so we won't get a memory leak in next step
+
+	// In case cache doesn't have parent, fall back to normal require
+	return parent === undefined || parent.require === undefined ? require(filePath) : parent.require(filePath);
+};