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/rrweb-cssom/lib/CSSMediaRule.js

@@ -0,0 +1,53 @@
+//.CommonJS
+var CSSOM = {
+	CSSRule: require("./CSSRule").CSSRule,
+	CSSGroupingRule: require("./CSSGroupingRule").CSSGroupingRule,
+	CSSConditionRule: require("./CSSConditionRule").CSSConditionRule,
+	MediaList: require("./MediaList").MediaList
+};
+///CommonJS
+
+
+/**
+ * @constructor
+ * @see http://dev.w3.org/csswg/cssom/#cssmediarule
+ * @see http://www.w3.org/TR/DOM-Level-2-Style/css.html#CSS-CSSMediaRule
+ */
+CSSOM.CSSMediaRule = function CSSMediaRule() {
+	CSSOM.CSSConditionRule.call(this);
+	this.media = new CSSOM.MediaList();
+};
+
+CSSOM.CSSMediaRule.prototype = new CSSOM.CSSConditionRule();
+CSSOM.CSSMediaRule.prototype.constructor = CSSOM.CSSMediaRule;
+CSSOM.CSSMediaRule.prototype.type = 4;
+
+// https://opensource.apple.com/source/WebCore/WebCore-7611.1.21.161.3/css/CSSMediaRule.cpp
+Object.defineProperties(CSSOM.CSSMediaRule.prototype, {
+  "conditionText": {
+    get: function() {
+      return this.media.mediaText;
+    },
+    set: function(value) {
+      this.media.mediaText = value;
+    },
+    configurable: true,
+    enumerable: true
+  },
+  "cssText": {
+    get: function() {
+      var cssTexts = [];
+      for (var i=0, length=this.cssRules.length; i < length; i++) {
+        cssTexts.push(this.cssRules[i].cssText);
+      }
+      return "@media " + this.media.mediaText + " {" + cssTexts.join("") + "}";
+    },
+    configurable: true,
+    enumerable: true
+  }
+});
+
+
+//.CommonJS
+exports.CSSMediaRule = CSSOM.CSSMediaRule;
+///CommonJS