feat: Добавить VitePress

docs/index.md

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+---
+layout: home
+title: SLM Design
+titleTemplate: false
+sidebar: false
+hero:
+  name: SLM Design
+  text: Explicit architecture boundaries
+  tagline: A draft specification for ownership, dependencies, runtime, and lifecycle in product applications.
+  actions:
+    - theme: brand
+      text: Русская спецификация
+      link: /ru/
+    - theme: alt
+      text: English
+      link: /en/
+features:
+  - title: Base SLM
+    details: A complete minimal architecture built around explicit ownership and five application layers.
+  - title: Independent overlays
+    details: Advanced and Pro add separate rule sets directly to base SLM without inheriting each other.
+  - title: Stable rules
+    details: Every normative requirement has a permanent rule ID suitable for reviews and automated checks.
+---