docs(adr): add glossary pages and ADR baseline structure

docs/adr/0001-monorepo-foundation.md

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+# ADR 0001: Monorepo Foundation
+
+- Status: Accepted
+- Date: 2026-02-10
+
+## Context
+
+The CMS platform requires:
+
+- separate admin and public apps
+- shared domain contracts and data access
+- consistent tooling and CI quality gates
+- incremental delivery through MVP stages
+
+A fragmented multi-repo setup would increase coordination overhead and duplicate shared contracts.
+
+## Decision
+
+Adopt a Bun workspace monorepo with:
+
+- `apps/admin` and `apps/web` for runtime surfaces
+- shared packages (`@cms/content`, `@cms/db`, `@cms/crud`, `@cms/ui`, `@cms/i18n`)
+- shared quality tooling (Biome, TypeScript, Vitest, Playwright, Turbo)
+
+## Consequences
+
+### Positive
+
+- shared contract updates propagate in one change set
+- easier cross-app refactors and testing
+- single CI pipeline with consistent gates
+
+### Negative
+
+- stronger need for workspace discipline and clear boundaries
+- larger repository clone/build surface
+- potential for cross-package coupling if conventions are not enforced