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-splitpanes/dist/Splitpanes.svelte.d.ts

@@ -0,0 +1,100 @@
+export declare const KEY: {};
+import type { IPane, IPaneSizingEvent } from './index.js';
+interface $$__sveltets_2_IsomorphicComponent<Props extends Record<string, any> = any, Events extends Record<string, any> = any, Slots extends Record<string, any> = any, Exports = {}, Bindings = string> {
+    new (options: import('svelte').ComponentConstructorOptions<Props>): import('svelte').SvelteComponent<Props, Events, Slots> & {
+        $$bindings?: Bindings;
+    } & Exports;
+    (internal: unknown, props: Props & {
+        $$events?: Events;
+        $$slots?: Slots;
+    }): Exports & {
+        $set?: any;
+        $on?: any;
+    };
+    z_$$bindings?: Bindings;
+}
+type $$__sveltets_2_PropsWithChildren<Props, Slots> = Props & (Slots extends {
+    default: any;
+} ? Props extends Record<string, never> ? any : {
+    children?: any;
+} : {});
+declare const Splitpanes: $$__sveltets_2_IsomorphicComponent<$$__sveltets_2_PropsWithChildren<{
+    id?: string;
+    horizontal?: boolean;
+    pushOtherPanes?: boolean;
+    dblClickSplitter?: boolean;
+    rtl?: boolean | "auto";
+    firstSplitter?: boolean;
+    style?: string | null;
+    theme?: string;
+    class?: string;
+}, {
+    default: {};
+}>, {
+    /**
+     * When clicking (or touching) a pane.
+     *
+     * Returns the clicked pane object with its dimensions.
+     */
+    'pane-click': CustomEvent<IPane>;
+    /**
+     * Fires when you click a splitter.
+     *
+     * Returns the next pane object (with its dimensions) directly after the clicked splitter.
+     *
+     * This event is only emitted if dragging did not occur between mousedown and mouseup.
+     */
+    'splitter-click': CustomEvent<IPane>;
+    /**
+     * Fires when the pane is maximized (ie. typically by double clicking the splitter).
+     *
+     * Returns the maximized pane object with its.
+     */
+    'pane-maximize': CustomEvent<IPane>;
+    /**
+     * Fires when splitpanes is ready.
+     */
+    ready: CustomEvent<void>;
+    /**
+     * Fires while resizing (on mousemove/touchmove).
+     *
+     * Returns the clicked pane object with its dimensions.
+     */
+    resize: CustomEvent<IPaneSizingEvent[]>;
+    /**
+     * Fires once when the resizing stops after user drag (on mouseup/touchend) or when adding or removing a pane.
+     *
+     * Returns the clicked pane object with its dimensions.
+     */
+    resized: CustomEvent<IPaneSizingEvent[]>;
+    /**
+     * Fires when a pane is added.
+     */
+    'pane-add': CustomEvent<{
+        /**
+         * The index of the added pane.
+         */
+        index: number;
+        /**
+         * The new array of panes after resize.
+         */
+        panes: IPaneSizingEvent[];
+    }>;
+    /**
+     * Fires when a pane is removed.
+     */
+    'pane-remove': CustomEvent<{
+        /**
+         * The removed pane.
+         */
+        removed: IPane;
+        /**
+         * An array of all the remaining pane objects with their dimensions (after resize).
+         */
+        panes: IPaneSizingEvent[];
+    }>;
+}, {
+    default: {};
+}, {}, string>;
+type Splitpanes = InstanceType<typeof Splitpanes>;
+export default Splitpanes;