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/svelte-toolbelt/dist/utils/merge-props.d.ts

@@ -0,0 +1,22 @@
+type Props = Record<string, unknown>;
+type PropsArg = Props | null | undefined;
+type TupleTypes<T> = {
+    [P in keyof T]: T[P];
+} extends {
+    [key: number]: infer V;
+} ? NullToObject<V> : never;
+type NullToObject<T> = T extends null | undefined ? {} : T;
+type UnionToIntersection<U> = (U extends any ? (k: U) => void : never) extends (k: infer I) => void ? I : never;
+/**
+ * Given a list of prop objects, merges them into a single object.
+ * - Automatically composes event handlers (e.g. `onclick`, `oninput`, etc.)
+ * - Chains regular functions with the same name so they are called in order
+ * - Merges class strings with `clsx`
+ * - Merges style objects and converts them to strings
+ * - Handles a bug with Svelte where setting the `hidden` attribute to `false` doesn't remove it
+ * - Overrides other values with the last one
+ */
+export declare function mergeProps<T extends PropsArg[]>(...args: T): UnionToIntersection<TupleTypes<T>> & {
+    style?: string;
+};
+export {};