Move specs and masterplan to docs/archive/, add architecture.md with
full technical overview, create 5 ADRs (Tauri v2, useReducer, sqlx
migrations, AES-256-GCM encryption, multi-profile DB), and move
guide-utilisateur.md into docs/.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Budget: monthly data grid with inline-editable planned amounts per
category, actuals from transactions, difference coloring, month
navigation, and save/apply/delete budget templates.
Adjustments: split-panel CRUD for manual adjustment entries.
Both features include FR/EN translations and follow existing
service/hook/component patterns.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
