docs(agile): initialize docs

docs/architecture/unified-project-structure.md

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+# 6. Unified Project Structure
+
+This is the final monorepo structure that integrates the frontend (`app/`), backend (`server/`), and database (`prisma/`) components.
+
+```plaintext
+system/
+├── app/                      # Nuxt frontend application
+│   ├── assets/
+│   │   └── scss/
+│   ├── components/
+│   ├── composables/
+│   ├── layouts/
+│   ├── pages/
+│   └── ...
+├── prisma/                   # Prisma ORM configuration
+│   ├── migrations/
+│   │   └── .../migration.sql
+│   └── schema.prisma         # The single source of truth for the database
+├── server/                   # Nuxt server-side logic (API)
+│   ├── api/
+│   │   └── ...
+│   ├── middleware/
+│   └── utils/
+├── types/                    # Shared TypeScript types
+│   ├── citizen.ts
+│   ├── ledger.ts
+│   └── index.ts
+├── docker-compose.yml        # Defines and runs the multi-container stack
+├── Dockerfile                # For building the Nuxt application image
+├── nuxt.config.ts            # Nuxt configuration
+├── package.json
+└── tsconfig.json
+```