oikos-web: extract the client stack from dtoro/oikos

Phase 1 of the hexagonal-architecture plan (dtoro/oikos
plans/2026-08-15-hexagonal-architecture.md). Moves the delivery stack
for the control-room UI into its own repo with its own pipeline:

- web/ — Svelte 5 SPA, verbatim (vendor/ included)
- desktop/ — Wails v3 wrapper, updateURL repointed to
  dtoro/oikos-web releases
- compose/ — Dockerfile + Caddyfile, verbatim (the /wails/* 404 and
  asset no-fallback quirks are load-bearing)
- docker-compose.yml — single web service, same 8091:80 publish,
  mem/cpu limits, and restart policy as the oikos stack's web service
- scripts/deploy.sh — mirrors oikos deploy essentials: CI-green gate,
  TOCTOU guard, version-tagged oikos-web:v$VERSION, prune to 3
- cmd/webhook + scripts/install-webhook.sh — standalone push-to-deploy
  receiver on :9798 (env-only secrets, no Infisical dependency)
- CI: the web job from oikos's ci.yml + the desktop build/release
  workflow, path-adjusted

Own VERSION (0.33.0) with the same bump-on-main rule; starts above
oikos's 0.32.x so the desktop updater sees an upgrade.

web/src/lib/components/DetailSection.svelte

@@ -0,0 +1,43 @@
+<script lang="ts">
+  import * as Collapsible from '$lib/components/ui/collapsible'
+  import ChevronDownIcon from '@lucide/svelte/icons/chevron-down'
+  import type { Snippet } from 'svelte'
+
+  let {
+    title,
+    count,
+    defaultOpen,
+    children
+  }: {
+    title: string
+    count?: number
+    defaultOpen: boolean
+    children: Snippet
+  } = $props()
+
+  let open = $state(false)
+  $effect(() => {
+    open = defaultOpen
+  })
+</script>
+
+<Collapsible.Root bind:open class="rounded-md border bg-card">
+  <Collapsible.Trigger
+    class="flex w-full cursor-pointer select-none items-center justify-between gap-2 px-2 py-1 text-left hover:bg-muted/50"
+  >
+    <span class="text-xs font-medium">{title}{count !== undefined ? ` (${count})` : ''}</span>
+    <ChevronDownIcon
+      class="size-3.5 shrink-0 text-muted-foreground transition-transform duration-200 {open
+        ? 'rotate-180'
+        : ''}"
+      aria-hidden="true"
+    />
+  </Collapsible.Trigger>
+  <Collapsible.Content
+    class="overflow-hidden data-[state=closed]:animate-out data-[state=closed]:fade-out data-[state=open]:animate-in data-[state=open]:fade-in"
+  >
+    <div class="border-t px-2 py-1.5">
+      {@render children()}
+    </div>
+  </Collapsible.Content>
+</Collapsible.Root>