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/eslint/lib/rules/no-restricted-syntax.js

@@ -0,0 +1,74 @@
+/**
+ * @fileoverview Rule to flag use of certain node types
+ * @author Burak Yigit Kaya
+ */
+"use strict";
+
+//------------------------------------------------------------------------------
+// Rule Definition
+//------------------------------------------------------------------------------
+
+/** @type {import('../types').Rule.RuleModule} */
+module.exports = {
+	meta: {
+		type: "suggestion",
+
+		docs: {
+			description: "Disallow specified syntax",
+			recommended: false,
+			url: "https://eslint.org/docs/latest/rules/no-restricted-syntax",
+		},
+
+		schema: {
+			type: "array",
+			items: {
+				oneOf: [
+					{
+						type: "string",
+					},
+					{
+						type: "object",
+						properties: {
+							selector: { type: "string" },
+							message: { type: "string" },
+						},
+						required: ["selector"],
+						additionalProperties: false,
+					},
+				],
+			},
+			uniqueItems: true,
+			minItems: 0,
+		},
+
+		messages: {
+			// eslint-disable-next-line eslint-plugin/report-message-format -- Custom message might not end in a period
+			restrictedSyntax: "{{message}}",
+		},
+	},
+
+	create(context) {
+		return context.options.reduce((result, selectorOrObject) => {
+			const isStringFormat = typeof selectorOrObject === "string";
+			const hasCustomMessage =
+				!isStringFormat && Boolean(selectorOrObject.message);
+
+			const selector = isStringFormat
+				? selectorOrObject
+				: selectorOrObject.selector;
+			const message = hasCustomMessage
+				? selectorOrObject.message
+				: `Using '${selector}' is not allowed.`;
+
+			return Object.assign(result, {
+				[selector](node) {
+					context.report({
+						node,
+						messageId: "restrictedSyntax",
+						data: { message },
+					});
+				},
+			});
+		}, {});
+	},
+};