docs: consolidate repository guides and preserve audit history

docs/_archive/pre-docs-cleanup-2026-09-11/docs/architecture/frontend.md

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+# Frontend Architecture
+
+## Goals
+
+The frontend should be:
+
+- Maintainable.
+- Consistent.
+- Easy to extend.
+
+---
+
+# Structure
+
+Organise by feature.
+
+Example:
+
+features/
+
+jobs/
+
+career/
+
+cv-builder/
+
+settings/
+
+auth/
+
+
+---
+
+# Components
+
+Prefer:
+
+Reusable components.
+
+Small focused components.
+
+---
+
+# Pages
+
+Pages should:
+
+- Compose components.
+- Handle routing.
+- Manage page-level state.
+
+---
+
+# State
+
+Avoid unnecessary global state.
+
+Use:
+
+- Local state.
+- Feature state.
+- Server state.
+
+Where appropriate.