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/postcss/lib/at-rule.d.ts

@@ -0,0 +1,139 @@
+import Container, {
+  ContainerProps,
+  ContainerWithChildren
+} from './container.js'
+
+declare namespace AtRule {
+  export interface AtRuleRaws extends Record<string, unknown> {
+    /**
+     * The space symbols after the last child of the node to the end of the node.
+     */
+    after?: string
+
+    /**
+     * The space between the at-rule name and its parameters.
+     */
+    afterName?: string
+
+    /**
+     * The space symbols before the node. It also stores `*`
+     * and `_` symbols before the declaration (IE hack).
+     */
+    before?: string
+
+    /**
+     * The symbols between the last parameter and `{` for rules.
+     */
+    between?: string
+
+    /**
+     * The rule’s selector with comments.
+     */
+    params?: {
+      raw: string
+      value: string
+    }
+
+    /**
+     * Contains `true` if the last child has an (optional) semicolon.
+     */
+    semicolon?: boolean
+  }
+
+  export interface AtRuleProps extends ContainerProps {
+    /** Name of the at-rule. */
+    name: string
+    /** Parameters following the name of the at-rule. */
+    params?: number | string
+    /** Information used to generate byte-to-byte equal node string as it was in the origin input. */
+    raws?: AtRuleRaws
+  }
+
+  export { AtRule_ as default }
+}
+
+/**
+ * Represents an at-rule.
+ *
+ * ```js
+ * Once (root, { AtRule }) {
+ *   let media = new AtRule({ name: 'media', params: 'print' })
+ *   media.append(…)
+ *   root.append(media)
+ * }
+ * ```
+ *
+ * If it’s followed in the CSS by a `{}` block, this node will have
+ * a nodes property representing its children.
+ *
+ * ```js
+ * const root = postcss.parse('@charset "UTF-8"; @media print {}')
+ *
+ * const charset = root.first
+ * charset.type  //=> 'atrule'
+ * charset.nodes //=> undefined
+ *
+ * const media = root.last
+ * media.nodes   //=> []
+ * ```
+ */
+declare class AtRule_ extends Container {
+  /**
+   * An array containing the layer’s children.
+   *
+   * ```js
+   * const root = postcss.parse('@layer example { a { color: black } }')
+   * const layer = root.first
+   * layer.nodes.length           //=> 1
+   * layer.nodes[0].selector      //=> 'a'
+   * ```
+   *
+   * Can be `undefinded` if the at-rule has no body.
+   *
+   * ```js
+   * const root = postcss.parse('@layer a, b, c;')
+   * const layer = root.first
+   * layer.nodes //=> undefined
+   * ```
+   */
+  nodes: Container['nodes'] | undefined
+  parent: ContainerWithChildren | undefined
+
+  raws: AtRule.AtRuleRaws
+  type: 'atrule'
+  /**
+   * The at-rule’s name immediately follows the `@`.
+   *
+   * ```js
+   * const root  = postcss.parse('@media print {}')
+   * const media = root.first
+   * media.name //=> 'media'
+   * ```
+   */
+  get name(): string
+  set name(value: string)
+
+  /**
+   * The at-rule’s parameters, the values that follow the at-rule’s name
+   * but precede any `{}` block.
+   *
+   * ```js
+   * const root  = postcss.parse('@media print, screen {}')
+   * const media = root.first
+   * media.params //=> 'print, screen'
+   * ```
+   */
+  get params(): string
+
+  set params(value: string)
+
+  constructor(defaults?: AtRule.AtRuleProps)
+  assign(overrides: AtRule.AtRuleProps | object): this
+  clone(overrides?: Partial<AtRule.AtRuleProps>): this
+  cloneAfter(overrides?: Partial<AtRule.AtRuleProps>): this
+  cloneBefore(overrides?: Partial<AtRule.AtRuleProps>): this
+}
+
+declare class AtRule extends AtRule_ {}
+
+export = AtRule