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-invalid-this.js

@@ -0,0 +1,178 @@
+/**
+ * @fileoverview A rule to disallow `this` keywords in contexts where the value of `this` is `undefined`.
+ * @author Toru Nagashima
+ */
+
+"use strict";
+
+//------------------------------------------------------------------------------
+// Requirements
+//------------------------------------------------------------------------------
+
+const astUtils = require("./utils/ast-utils");
+
+//------------------------------------------------------------------------------
+// Helpers
+//------------------------------------------------------------------------------
+
+/**
+ * Determines if the given code path is a code path with lexical `this` binding.
+ * That is, if `this` within the code path refers to `this` of surrounding code path.
+ * @param {CodePath} codePath Code path.
+ * @param {ASTNode} node Node that started the code path.
+ * @returns {boolean} `true` if it is a code path with lexical `this` binding.
+ */
+function isCodePathWithLexicalThis(codePath, node) {
+	return (
+		codePath.origin === "function" &&
+		node.type === "ArrowFunctionExpression"
+	);
+}
+
+//------------------------------------------------------------------------------
+// Rule Definition
+//------------------------------------------------------------------------------
+
+/** @type {import('../types').Rule.RuleModule} */
+module.exports = {
+	meta: {
+		dialects: ["javascript", "typescript"],
+		language: "javascript",
+		type: "suggestion",
+
+		defaultOptions: [{ capIsConstructor: true }],
+
+		docs: {
+			description:
+				"Disallow use of `this` in contexts where the value of `this` is `undefined`",
+			recommended: false,
+			url: "https://eslint.org/docs/latest/rules/no-invalid-this",
+		},
+
+		schema: [
+			{
+				type: "object",
+				properties: {
+					capIsConstructor: {
+						type: "boolean",
+					},
+				},
+				additionalProperties: false,
+			},
+		],
+
+		messages: {
+			unexpectedThis: "Unexpected 'this'.",
+		},
+	},
+
+	create(context) {
+		const [{ capIsConstructor }] = context.options;
+		const stack = [],
+			sourceCode = context.sourceCode;
+
+		/**
+		 * Gets the current checking context.
+		 *
+		 * The return value has a flag that whether or not `this` keyword is valid.
+		 * The flag is initialized when got at the first time.
+		 * @returns {{valid: boolean}}
+		 *   an object which has a flag that whether or not `this` keyword is valid.
+		 */
+		stack.getCurrent = function () {
+			const current = this.at(-1);
+
+			if (!current.init) {
+				current.init = true;
+				current.valid = !astUtils.isDefaultThisBinding(
+					current.node,
+					sourceCode,
+					{ capIsConstructor },
+				);
+			}
+			return current;
+		};
+
+		return {
+			onCodePathStart(codePath, node) {
+				if (isCodePathWithLexicalThis(codePath, node)) {
+					return;
+				}
+
+				if (codePath.origin === "program") {
+					const scope = sourceCode.getScope(node);
+					const features =
+						context.languageOptions.parserOptions.ecmaFeatures ||
+						{};
+
+					// `this` at the top level of scripts always refers to the global object
+					stack.push({
+						init: true,
+						node,
+						valid: !(
+							node.sourceType === "module" ||
+							(features.globalReturn &&
+								scope.childScopes[0].isStrict)
+						),
+					});
+
+					return;
+				}
+
+				/*
+				 * `init: false` means that `valid` isn't determined yet.
+				 * Most functions don't use `this`, and the calculation for `valid`
+				 * is relatively costly, so we'll calculate it lazily when the first
+				 * `this` within the function is traversed. A special case are non-strict
+				 * functions, because `this` refers to the global object and therefore is
+				 * always valid, so we can set `init: true` right away.
+				 */
+				stack.push({
+					init: !sourceCode.getScope(node).isStrict,
+					node,
+					valid: true,
+				});
+			},
+
+			onCodePathEnd(codePath, node) {
+				if (isCodePathWithLexicalThis(codePath, node)) {
+					return;
+				}
+
+				stack.pop();
+			},
+
+			"AccessorProperty > *.value"(node) {
+				stack.push({
+					init: true,
+					node,
+					valid: true,
+				});
+			},
+
+			"AccessorProperty:exit"() {
+				stack.pop();
+			},
+
+			// Reports if `this` of the current context is invalid.
+			ThisExpression(node) {
+				// Special case: skip `this` if it's the value of an AccessorProperty
+				if (
+					node.parent.type === "AccessorProperty" &&
+					node.parent.value === node
+				) {
+					return;
+				}
+
+				const current = stack.getCurrent();
+
+				if (current && !current.valid) {
+					context.report({
+						node,
+						messageId: "unexpectedThis",
+					});
+				}
+			},
+		};
+	},
+};