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/cssstyle/lib/properties/flex.js

@@ -0,0 +1,73 @@
+"use strict";
+
+const parsers = require("../parsers");
+const flexGrow = require("./flexGrow");
+const flexShrink = require("./flexShrink");
+const flexBasis = require("./flexBasis");
+
+const shorthandFor = new Map([
+  ["flex-grow", flexGrow],
+  ["flex-shrink", flexShrink],
+  ["flex-basis", flexBasis]
+]);
+
+module.exports.parse = function parse(v) {
+  const key = parsers.parseKeyword(v, ["auto", "none"]);
+  if (key) {
+    if (key === "auto") {
+      return "1 1 auto";
+    }
+    if (key === "none") {
+      return "0 0 auto";
+    }
+    if (key === "initial") {
+      return "0 1 auto";
+    }
+    return;
+  }
+  const obj = parsers.parseShorthand(v, shorthandFor);
+  if (obj) {
+    const flex = {
+      "flex-grow": "1",
+      "flex-shrink": "1",
+      "flex-basis": "0%"
+    };
+    const items = Object.entries(obj);
+    for (const [property, value] of items) {
+      flex[property] = value;
+    }
+    return [...Object.values(flex)].join(" ");
+  }
+};
+
+module.exports.isValid = function isValid(v) {
+  if (v === "") {
+    return true;
+  }
+  return typeof module.exports.parse(v) === "string";
+};
+
+module.exports.definition = {
+  set(v) {
+    v = parsers.prepareValue(v, this._global);
+    if (parsers.hasVarFunc(v)) {
+      this._shorthandSetter("flex", "", shorthandFor);
+      this._setProperty("flex", v);
+    } else {
+      this._shorthandSetter("flex", module.exports.parse(v), shorthandFor);
+    }
+  },
+  get() {
+    let val = this.getPropertyValue("flex");
+    if (parsers.hasVarFunc(val)) {
+      return val;
+    }
+    val = this._shorthandGetter("flex", shorthandFor);
+    if (parsers.hasVarFunc(val)) {
+      return "";
+    }
+    return val;
+  },
+  enumerable: true,
+  configurable: true
+};