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/bits-ui/dist/internal/attrs.js

@@ -0,0 +1,58 @@
+export function boolToStr(condition) {
+    return condition ? "true" : "false";
+}
+export function boolToStrTrueOrUndef(condition) {
+    return condition ? "true" : undefined;
+}
+export function boolToEmptyStrOrUndef(condition) {
+    return condition ? "" : undefined;
+}
+export function boolToTrueOrUndef(condition) {
+    return condition ? true : undefined;
+}
+export function getDataOpenClosed(condition) {
+    return condition ? "open" : "closed";
+}
+export function getDataChecked(condition) {
+    return condition ? "checked" : "unchecked";
+}
+export function getDataTransitionAttrs(state) {
+    if (state === "starting")
+        return { "data-starting-style": "" };
+    if (state === "ending")
+        return { "data-ending-style": "" };
+    return {};
+}
+export function getAriaChecked(checked, indeterminate) {
+    if (indeterminate)
+        return "mixed";
+    return checked ? "true" : "false";
+}
+export class BitsAttrs {
+    #variant;
+    #prefix;
+    attrs;
+    constructor(config) {
+        this.#variant = config.getVariant ? config.getVariant() : null;
+        this.#prefix = this.#variant ? `data-${this.#variant}-` : `data-${config.component}-`;
+        this.getAttr = this.getAttr.bind(this);
+        this.selector = this.selector.bind(this);
+        this.attrs = Object.fromEntries(config.parts.map((part) => [part, this.getAttr(part)]));
+    }
+    getAttr(part, variantOverride) {
+        if (variantOverride)
+            return `data-${variantOverride}-${part}`;
+        return `${this.#prefix}${part}`;
+    }
+    selector(part, variantOverride) {
+        return `[${this.getAttr(part, variantOverride)}]`;
+    }
+}
+export function createBitsAttrs(config) {
+    const bitsAttrs = new BitsAttrs(config);
+    return {
+        ...bitsAttrs.attrs,
+        selector: bitsAttrs.selector,
+        getAttr: bitsAttrs.getAttr,
+    };
+}