feat: Home Assistant provider — WebSocket subscription + bot commands

Adds Home Assistant as a service provider with two coordinated surfaces:

Notifications (subscription):
- Long-lived WebSocket client (aiohttp ws_connect) with auth handshake,
  exponential-backoff reconnect, bounded event queue, and area-registry
  enrichment cached per (re)connect
- ServiceProvider ABC gains an optional `subscribe()` method for push-style
  providers; HomeAssistantServiceProvider uses it via a per-provider
  supervisor task started in the FastAPI lifespan
- 4 event types (state_changed, automation_triggered, call_service,
  event_fired), 4 default Jinja templates (en + ru), HA-specific
  tracker filters (entity_glob, domain_allowlist, exact entity ids)
- Extracted shared dispatch pipeline (api/webhooks.py → services/
  event_dispatch.py) so subscription and webhook ingest share the same
  event_log + deferred-dispatch + quiet-hours code path

Bot commands:
- /status, /entities [glob], /state <entity_id>, /areas
- Multi-command WS session so /status and /areas cost one handshake
- Sensitive-attribute blocklist (camera access_token, entity_picture, etc.)
  and 30-attribute cap to keep /state output safe and within Telegram's
  message size
- Error-message redaction strips URL userinfo before surfacing to chat

Frontend:
- HA descriptor with toggle ConfigField type (new) and tag-input filter
  mode for free-text glob/domain lists (new TagInput component)
- 15 command slots + 4 notification slots wired into the existing
  template-config UI

frontend/src/routes/notification-trackers/TrackerForm.svelte

@@ -7,6 +7,7 @@
 	import MdiIcon from '$lib/components/MdiIcon.svelte';
 	import EntitySelect from '$lib/components/EntitySelect.svelte';
 	import MultiEntitySelect from '$lib/components/MultiEntitySelect.svelte';
+	import TagInput from '$lib/components/TagInput.svelte';
 	import { getDescriptor } from '$lib/providers';
 
 	interface Props {
@@ -123,14 +124,24 @@
 		{#if descriptor?.userFilters && descriptor.userFilters.length > 0}
 			{@const userItems = users.map(u => ({ value: u.id, label: u.name }))}
 			{#each descriptor.userFilters as uf (uf.key)}
+				{@const filterKey = uf.filterKey ?? uf.key}
 				<div>
 					<div class="block text-sm font-medium mb-1">{t(uf.label)}</div>
-					<MultiEntitySelect
-						items={userItems.map(i => ({ ...i, icon: uf.icon }))}
-						values={form.filters[uf.key] || []}
-						onchange={(vals) => form.filters = { ...form.filters, [uf.key]: vals }}
-						placeholder={t(uf.placeholder)}
-					/>
+					{#if uf.inputMode === 'tags'}
+						<TagInput
+							values={form.filters[filterKey] || []}
+							onchange={(vals) => form.filters = { ...form.filters, [filterKey]: vals }}
+							placeholder={t(uf.placeholder)}
+							icon={uf.icon}
+						/>
+					{:else}
+						<MultiEntitySelect
+							items={userItems.map(i => ({ ...i, icon: uf.icon }))}
+							values={form.filters[filterKey] || []}
+							onchange={(vals) => form.filters = { ...form.filters, [filterKey]: vals }}
+							placeholder={t(uf.placeholder)}
+						/>
+					{/if}
 				</div>
 			{/each}
 		{/if}