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/eslint/lib/rules/no-mixed-spaces-and-tabs.js

@@ -0,0 +1,148 @@
+/**
+ * @fileoverview Disallow mixed spaces and tabs for indentation
+ * @author Jary Niebur
+ * @deprecated in ESLint v8.53.0
+ */
+"use strict";
+
+//------------------------------------------------------------------------------
+// Rule Definition
+//------------------------------------------------------------------------------
+
+/** @type {import('../types').Rule.RuleModule} */
+module.exports = {
+	meta: {
+		deprecated: {
+			message: "Formatting rules are being moved out of ESLint core.",
+			url: "https://eslint.org/blog/2023/10/deprecating-formatting-rules/",
+			deprecatedSince: "8.53.0",
+			availableUntil: "11.0.0",
+			replacedBy: [
+				{
+					message:
+						"ESLint Stylistic now maintains deprecated stylistic core rules.",
+					url: "https://eslint.style/guide/migration",
+					plugin: {
+						name: "@stylistic/eslint-plugin",
+						url: "https://eslint.style",
+					},
+					rule: {
+						name: "no-mixed-spaces-and-tabs",
+						url: "https://eslint.style/rules/no-mixed-spaces-and-tabs",
+					},
+				},
+			],
+		},
+		type: "layout",
+
+		docs: {
+			description: "Disallow mixed spaces and tabs for indentation",
+			recommended: false,
+			url: "https://eslint.org/docs/latest/rules/no-mixed-spaces-and-tabs",
+		},
+
+		schema: [
+			{
+				enum: ["smart-tabs", true, false],
+			},
+		],
+
+		messages: {
+			mixedSpacesAndTabs: "Mixed spaces and tabs.",
+		},
+	},
+
+	create(context) {
+		const sourceCode = context.sourceCode;
+
+		let smartTabs;
+
+		switch (context.options[0]) {
+			case true: // Support old syntax, maybe add deprecation warning here
+			case "smart-tabs":
+				smartTabs = true;
+				break;
+			default:
+				smartTabs = false;
+		}
+
+		//--------------------------------------------------------------------------
+		// Public
+		//--------------------------------------------------------------------------
+
+		return {
+			"Program:exit"(node) {
+				const lines = sourceCode.lines,
+					comments = sourceCode.getAllComments(),
+					ignoredCommentLines = new Set();
+
+				// Add all lines except the first ones.
+				comments.forEach(comment => {
+					for (
+						let i = comment.loc.start.line + 1;
+						i <= comment.loc.end.line;
+						i++
+					) {
+						ignoredCommentLines.add(i);
+					}
+				});
+
+				/*
+				 * At least one space followed by a tab
+				 * or the reverse before non-tab/-space
+				 * characters begin.
+				 */
+				let regex = /^(?=( +|\t+))\1(?:\t| )/u;
+
+				if (smartTabs) {
+					/*
+					 * At least one space followed by a tab
+					 * before non-tab/-space characters begin.
+					 */
+					// eslint-disable-next-line regexp/no-empty-lookarounds-assertion -- False positive
+					regex = /^(?=(\t*))\1(?=( +))\2\t/u;
+				}
+
+				lines.forEach((line, i) => {
+					const match = regex.exec(line);
+
+					if (match) {
+						const lineNumber = i + 1;
+						const loc = {
+							start: {
+								line: lineNumber,
+								column: match[0].length - 2,
+							},
+							end: {
+								line: lineNumber,
+								column: match[0].length,
+							},
+						};
+
+						if (!ignoredCommentLines.has(lineNumber)) {
+							const containingNode =
+								sourceCode.getNodeByRangeIndex(
+									sourceCode.getIndexFromLoc(loc.start),
+								);
+
+							if (
+								!(
+									containingNode &&
+									["Literal", "TemplateElement"].includes(
+										containingNode.type,
+									)
+								)
+							) {
+								context.report({
+									node,
+									loc,
+									messageId: "mixedSpacesAndTabs",
+								});
+							}
+						}
+					}
+				});
+			},
+		};
+	},
+};