refactor: extract Installation Guides into block renderer components

Replace monolithic Connection.tsx (1076 lines) with modular architecture:
- 4 block renderers (cards, timeline, accordion, minimal) selectable
  via uiConfig.installationGuidesBlockType from RemnaWave config
- Color parser utility with 14 named colors + hex support
- InstallationGuide component handles platform/app selection and
  button rendering (subscriptionLink, copyButton, external)
- Remove classic step-based format (AppButton, AppStep, AppInfo)
- Add appConfig query invalidation on admin UUID change

src/components/connection/blocks/index.ts

@@ -0,0 +1,5 @@
+export { CardsBlock } from './CardsBlock';
+export { TimelineBlock } from './TimelineBlock';
+export { AccordionBlock } from './AccordionBlock';
+export { MinimalBlock } from './MinimalBlock';
+export type { BlockRendererProps } from './types';