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/util/fileURLToPath.js

@@ -0,0 +1,93 @@
+/*
+	MIT License http://www.opensource.org/licenses/mit-license.php
+*/
+
+"use strict";
+
+// A runtime-agnostic port of Node's `url.fileURLToPath`, built on the global
+// `URL` (available in Node, browsers, Deno and Bun) so the resolver does not
+// depend on the Node `url` builtin. The platform branch can be forced via the
+// `windows` option; otherwise it follows the host platform like Node does.
+
+const CHAR_LOWERCASE_A = 97;
+const CHAR_LOWERCASE_Z = 122;
+
+const isWindows =
+	typeof process !== "undefined" && process.platform === "win32";
+
+const forwardSlashRegEx = /\//g;
+
+/**
+ * @param {URL} url file: URL instance
+ * @returns {string} Windows filesystem path
+ */
+function getPathFromURLWin32(url) {
+	const { hostname } = url;
+	let { pathname } = url;
+	for (let n = 0; n < pathname.length; n++) {
+		if (pathname[n] === "%") {
+			const third = (pathname.codePointAt(n + 2) || 0) | 0x20;
+			if (
+				(pathname[n + 1] === "2" && third === 102) || // 2f 2F (/)
+				(pathname[n + 1] === "5" && third === 99) // 5c 5C (\)
+			) {
+				throw new TypeError(
+					"File URL path must not include encoded \\ or / characters",
+				);
+			}
+		}
+	}
+	pathname = pathname.replace(forwardSlashRegEx, "\\");
+	pathname = decodeURIComponent(pathname);
+	if (hostname !== "") {
+		// UNC path: `\\host\share\…`. Node runs the host through
+		// `domainToUnicode`; we keep the (already punycode) hostname as-is,
+		// which is identical for ASCII hosts and only differs for rare IDN UNC.
+		return `\\\\${hostname}${pathname}`;
+	}
+	const letter = (pathname.codePointAt(1) || 0) | 0x20;
+	const sep = pathname.charAt(2);
+	if (letter < CHAR_LOWERCASE_A || letter > CHAR_LOWERCASE_Z || sep !== ":") {
+		throw new TypeError("File URL path must be absolute");
+	}
+	return pathname.slice(1);
+}
+
+/**
+ * @param {URL} url file: URL instance
+ * @returns {string} POSIX filesystem path
+ */
+function getPathFromURLPosix(url) {
+	if (url.hostname !== "") {
+		throw new TypeError('File URL host must be "localhost" or empty');
+	}
+	const { pathname } = url;
+	for (let n = 0; n < pathname.length; n++) {
+		if (pathname[n] === "%") {
+			const third = (pathname.codePointAt(n + 2) || 0) | 0x20;
+			if (pathname[n + 1] === "2" && third === 102) {
+				throw new TypeError(
+					"File URL path must not include encoded / characters",
+				);
+			}
+		}
+	}
+	return decodeURIComponent(pathname);
+}
+
+/**
+ * @param {string | URL} path a `file:` URL string or `URL` instance
+ * @param {{ windows?: boolean }=} options force the platform branch
+ * @returns {string} the filesystem path
+ */
+function fileURLToPath(path, options) {
+	const url = typeof path === "string" ? new URL(path) : path;
+	if (url.protocol !== "file:") {
+		throw new TypeError("The URL must be of scheme file");
+	}
+	const windows =
+		options && options.windows !== undefined ? options.windows : isWindows;
+	return windows ? getPathFromURLWin32(url) : getPathFromURLPosix(url);
+}
+
+module.exports = fileURLToPath;