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/eslintrc/lib/shared/deep-merge-arrays.js

@@ -0,0 +1,58 @@
+/**
+ * @fileoverview Applies default rule options
+ * @author JoshuaKGoldberg
+ */
+
+/**
+ * Check if the variable contains an object strictly rejecting arrays
+ * @param {unknown} value an object
+ * @returns {boolean} Whether value is an object
+ */
+function isObjectNotArray(value) {
+    return typeof value === "object" && value !== null && !Array.isArray(value);
+}
+
+/**
+ * Deeply merges second on top of first, creating a new {} object if needed.
+ * @param {T} first Base, default value.
+ * @param {U} second User-specified value.
+ * @returns {T | U | (T & U)} Merged equivalent of second on top of first.
+ */
+function deepMergeObjects(first, second) {
+    if (second === void 0) {
+        return first;
+    }
+
+    if (!isObjectNotArray(first) || !isObjectNotArray(second)) {
+        return second;
+    }
+
+    const result = { ...first, ...second };
+
+    for (const key of Object.keys(second)) {
+        if (Object.prototype.propertyIsEnumerable.call(first, key)) {
+            result[key] = deepMergeObjects(first[key], second[key]);
+        }
+    }
+
+    return result;
+}
+
+/**
+ * Deeply merges second on top of first, creating a new [] array if needed.
+ * @param {T[] | undefined} first Base, default values.
+ * @param {U[] | undefined} second User-specified values.
+ * @returns {(T | U | (T & U))[]} Merged equivalent of second on top of first.
+ */
+function deepMergeArrays(first, second) {
+    if (!first || !second) {
+        return second || first || [];
+    }
+
+    return [
+        ...first.map((value, i) => deepMergeObjects(value, second[i])),
+        ...second.slice(first.length)
+    ];
+}
+
+export { deepMergeArrays };