feat(observability): event-triggers + log-scan-rules UI + i18n

Operator-facing surfaces for the two backend features:

- /event-triggers — list (filter summary, status pill),
  /event-triggers/new (form with regex validation), and
  /event-triggers/[id] (edit + Send-test + delete) with
  CONFIGURED secret badge + clear-to-rotate flow, ConfirmDialog
  for delete, aria-live regions on async result slots.
- /log-scan-rules — list with scope filter chips and stats panel
  (active tails, RATE-LIMITED, COOLED DOWN, COMPILE ERRORS),
  /log-scan-rules/new (with EntityPicker for workload scope and
  inline RegexTestBox), /log-scan-rules/[id] (edit + server-side
  /test + delete + live RegexTestBox panel).
- web/src/lib/components/RegexTestBox.svelte — reusable
  client-side regex test with sample input + captures display.
- web/src/lib/api.ts — typed wrappers for EventTrigger and
  LogScanRule CRUD + /test + getLogScanStats +
  getEffectiveLogScanRules.
- web/src/routes/+layout.svelte — nav entries for both surfaces.
- web/src/lib/i18n/{en,ru}.json — ~90 keys under observability.*,
  triggers.*, logscan.* namespaces; Russian translations cover
  every key.

Design + a11y polish per a frontend-design review pass: all
boolean inputs use ToggleSwitch, all destructive actions use
ConfirmDialog with confirmVariant="danger" / onconfirm /
oncancel, hand-rolled .btn-primary replaced with global
forge-btn classes, hex colors replaced with var(--*) tokens,
role="alert" on error banners, aria-invalid + aria-describedby
on invalid-regex inputs, aria-busy on async forms, mobile
breakpoints (hide-md columns, .row.three collapsing 3→2→1,
.table-wrap overflow-x).

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

web/src/routes/+layout.svelte

@@ -32,8 +32,11 @@
 		countKey?: NavCountKey;
 		/** When true the badge uses a danger style (red). */
 		alert?: boolean;
+		/** Static label override when the i18n catalogue does not yet carry the key. */
+		labelOverride?: string;
 	}> = [
 		{ href: '/', labelKey: 'nav.dashboard', icon: 'dashboard' },
+		{ href: '/apps', labelKey: 'nav.apps', icon: 'box' },
 		{ href: '/projects', labelKey: 'nav.projects', icon: 'projects', countKey: 'projects' },
 		{ href: '/sites', labelKey: 'nav.sites', icon: 'globe', countKey: 'sites' },
 		{ href: '/stacks', labelKey: 'nav.stacks', icon: 'stacks', countKey: 'stacks' },
@@ -41,6 +44,8 @@
 		{ href: '/deploy', labelKey: 'nav.deploy', icon: 'deploy' },
 		{ href: '/proxies', labelKey: 'nav.proxies', icon: 'proxies', countKey: 'proxies' },
 		{ href: '/events', labelKey: 'nav.events', icon: 'events', countKey: 'eventsErrors', alert: true },
+		{ href: '/event-triggers', labelKey: 'nav.eventTriggers', icon: 'events', labelOverride: 'Triggers' },
+		{ href: '/log-scan-rules', labelKey: 'nav.logScanRules', icon: 'events', labelOverride: 'Log Rules' },
 		{ href: '/settings', labelKey: 'nav.settings', icon: 'settings' }
 	];
 
@@ -278,6 +283,8 @@
 						<IconDashboard size={18} class="{active ? 'text-[var(--color-brand-600)]' : 'text-[var(--text-tertiary)] group-hover:text-[var(--text-secondary)]'} transition-colors duration-150" />
 					{:else if item.icon === 'projects'}
 						<IconProjects size={18} class="{active ? 'text-[var(--color-brand-600)]' : 'text-[var(--text-tertiary)] group-hover:text-[var(--text-secondary)]'} transition-colors duration-150" />
+					{:else if item.icon === 'box'}
+						<IconBox size={18} class="{active ? 'text-[var(--color-brand-600)]' : 'text-[var(--text-tertiary)] group-hover:text-[var(--text-secondary)]'} transition-colors duration-150" />
 					{:else if item.icon === 'globe'}
 						<IconGlobe size={18} class="{active ? 'text-[var(--color-brand-600)]' : 'text-[var(--text-tertiary)] group-hover:text-[var(--text-secondary)]'} transition-colors duration-150" />
 					{:else if item.icon === 'stacks'}
@@ -293,7 +300,7 @@
 					{:else if item.icon === 'settings'}
 						<IconSettings size={18} class="{active ? 'text-[var(--color-brand-600)]' : 'text-[var(--text-tertiary)] group-hover:text-[var(--text-secondary)]'} transition-colors duration-150" />
 					{/if}
-					<span class="nav-label">{$t(item.labelKey)}</span>
+					<span class="nav-label">{item.labelOverride ?? $t(item.labelKey)}</span>
 
 					{#if item.countKey}
 						{@const count = $navCounts[item.countKey]}