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/enhanced-resolve/lib/AliasFieldPlugin.js

@@ -0,0 +1,123 @@
+/*
+	MIT License http://www.opensource.org/licenses/mit-license.php
+	Author Tobias Koppers @sokra
+*/
+
+"use strict";
+
+const DescriptionFileUtils = require("./DescriptionFileUtils");
+const getInnerRequest = require("./getInnerRequest");
+
+/** @typedef {import("./Resolver")} Resolver */
+/** @typedef {import("./Resolver").JsonPrimitive} JsonPrimitive */
+/** @typedef {import("./Resolver").ResolveRequest} ResolveRequest */
+/** @typedef {import("./Resolver").ResolveStepHook} ResolveStepHook */
+
+// Sentinel stored in `_fieldDataCache` when a description file does not
+// contain a usable alias field object. Lets us distinguish "not cached yet"
+// from "no valid field" without calling back into `getField`.
+const NO_FIELD_OBJECT = Symbol("NoFieldObject");
+
+module.exports = class AliasFieldPlugin {
+	/**
+	 * @param {string | ResolveStepHook} source source
+	 * @param {string | string[]} field field
+	 * @param {string | ResolveStepHook} target target
+	 */
+	constructor(source, field, target) {
+		this.source = source;
+		this.field = field;
+		this.target = target;
+		// `this.field` is fixed for the plugin's lifetime, so caching
+		// per description-file content is safe. The cached value is either
+		// the resolved alias-map object or the `NO_FIELD_OBJECT` sentinel
+		// meaning "description file has no usable alias field".
+		/** @type {WeakMap<import("./Resolver").JsonObject, { [k: string]: JsonPrimitive } | typeof NO_FIELD_OBJECT>} */
+		this._fieldDataCache = new WeakMap();
+	}
+
+	/**
+	 * @param {Resolver} resolver the resolver
+	 * @returns {void}
+	 */
+	apply(resolver) {
+		const target = resolver.ensureHook(this.target);
+		resolver
+			.getHook(this.source)
+			.tapAsync("AliasFieldPlugin", (request, resolveContext, callback) => {
+				if (!request.descriptionFileData) return callback();
+				const innerRequest = getInnerRequest(resolver, request);
+				if (!innerRequest) return callback();
+				const { descriptionFileData } = request;
+				let fieldData = this._fieldDataCache.get(descriptionFileData);
+				if (fieldData === undefined) {
+					const raw = DescriptionFileUtils.getField(
+						descriptionFileData,
+						this.field,
+					);
+					fieldData =
+						raw === null || typeof raw !== "object"
+							? NO_FIELD_OBJECT
+							: /** @type {{ [k: string]: JsonPrimitive }} */ (raw);
+					this._fieldDataCache.set(descriptionFileData, fieldData);
+				}
+				if (fieldData === NO_FIELD_OBJECT) {
+					if (resolveContext.log) {
+						resolveContext.log(
+							`Field '${this.field}' doesn't contain a valid alias configuration`,
+						);
+					}
+					return callback();
+				}
+				/** @type {JsonPrimitive | undefined} */
+				const data = Object.prototype.hasOwnProperty.call(
+					fieldData,
+					innerRequest,
+				)
+					? /** @type {{ [Key in string]: JsonPrimitive }} */ (fieldData)[
+							innerRequest
+						]
+					: innerRequest.startsWith("./")
+						? /** @type {{ [Key in string]: JsonPrimitive }} */ (fieldData)[
+								innerRequest.slice(2)
+							]
+						: undefined;
+				if (data === innerRequest) return callback();
+				if (data === undefined) return callback();
+				if (data === false) {
+					/** @type {ResolveRequest} */
+					const ignoreObj = {
+						...request,
+						path: false,
+					};
+					if (typeof resolveContext.yield === "function") {
+						resolveContext.yield(ignoreObj);
+						return callback(null, null);
+					}
+					return callback(null, ignoreObj);
+				}
+				/** @type {ResolveRequest} */
+				const obj = {
+					...request,
+					path: /** @type {string} */ (request.descriptionFileRoot),
+					request: /** @type {string} */ (data),
+					fullySpecified: false,
+				};
+				resolver.doResolve(
+					target,
+					obj,
+					`aliased from description file ${
+						request.descriptionFilePath
+					} with mapping '${innerRequest}' to '${/** @type {string} */ data}'`,
+					resolveContext,
+					(err, result) => {
+						if (err) return callback(err);
+
+						// Don't allow other aliasing or raw request
+						if (result === undefined) return callback(null, null);
+						callback(null, result);
+					},
+				);
+			});
+	}
+};