test+ci: 51 frontend unit-тестов (Vitest) + CI rollback на single resolve-tag

Tests (Vitest):
- src/lib/dates.ts (вынесено из SchemaDrivenForm + dictionaries.$name): parseFormDate,
  formatIsoDate, formatIsoDateTime, extractTime, combineDateTime, localTzOffset, nowIsoLocal
- src/lib/dates.test.ts (20 tests): TZ-safety, pure-date local midnight, far-future filter,
  round-trip parse/format, time extraction в local TZ, clear-button (null Date → '')
- src/components/schema/types.test.ts (31 tests): buildSchemaJson всех 9 kinds + x-unique +
  x-id-source, parseSchemaJson roundtrip, diffSchemas (8 breaking detection cases),
  suggestVersionBump (major/minor/patch + breaking-wins-mix)

CI:
- Откатил dual resolve-tag (BACKEND/FRONTEND) на single resolve-tag.
  GitLab variable interpolation в trigger jobs не подхватывает dotenv от needs-job
  → admin-ui-only push не доезжал до infra. Now backwards compat path работает
  как раньше с UPSTREAM_IMAGE_TAG.
- Backend docker jobs (maven-package + 4 docker-*) теперь без rules:changes —
  catch ImagePullBackOff если frontend push шёл без backend rebuild. BuildKit cache
  делает повторный билд идентичных layers ~30 sec.
- Path-filter оставлен на maven-test (тесты не запускаются на frontend-only PR
  — они бэкендовые) и на docker-admin-ui (frontend-only).

Run: pnpm test → 51 passed.

ordinis-admin-ui/src/routes/dictionaries.$name.tsx

@@ -27,6 +27,7 @@ import type { CreateRecordRequest, FlattenedRecord } from '@/api/client'
 import { SchemaDrivenForm } from '@/components/form/SchemaDrivenForm'
 import { DictionaryEditorDialog } from '@/components/schema/DictionaryEditorDialog'
 import { RecordHistoryDrawer } from '@/components/record/RecordHistoryDrawer'
+import { nowIsoLocal } from '@/lib/dates'
 
 export const Route = createFileRoute('/dictionaries/$name')({
   component: DictionaryDetail,
@@ -323,16 +324,6 @@ function DictionaryDetail() {
   )
 }
 
-const nowIsoLocal = (): string => {
-  const d = new Date()
-  const pad = (n: number) => String(n).padStart(2, '0')
-  const off = -d.getTimezoneOffset()
-  const sign = off >= 0 ? '+' : '-'
-  const abs = Math.abs(off)
-  const tz = `${sign}${pad(Math.floor(abs / 60))}:${pad(abs % 60)}`
-  return `${d.getFullYear()}-${pad(d.getMonth() + 1)}-${pad(d.getDate())}T${pad(d.getHours())}:${pad(d.getMinutes())}:00${tz}`
-}
-
 const toIsoDate = (iso: string | undefined): string => {
   if (!iso) return ''
   const d = new Date(iso)