docs: add task history for documentation reorganization

Author: Fguedes90

TASK_HISTORY/Phase_9_Documentation_Reorganization_20240518.md

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+# Phase 9: Documentation Reorganization
+
+## Overview
+
+This phase focused on reorganizing the project documentation into a structured and maintainable format. The goal was to create a comprehensive documentation structure that follows industry standards and makes information easy to find for developers.
+
+## Tasks Completed
+
+### Phase 9: Reorganização da Documentação ✅
+
+- [x] Criar estrutura de pastas docs/ seguindo as práticas recomendadas
+- [x] Criar documentação de introdução (getting-started)
+- [x] Criar documentação de arquitetura detalhada
+- [x] Criar documentação de fluxo de desenvolvimento
+- [x] Criar guias práticos para extensão da API
+- [x] Criar documentação de testes
+- [x] Criar documentação de deployment
+- [x] Remover arquivos de documentação redundantes após migração
+- [x] Garantir consistência de estilo em toda a documentação
+
+## Implementation Details
+
+### Documentation Structure
+
+Created a comprehensive documentation structure:
+
+```
+docs/
+├── README.md                           # Entry point with navigation
+├── 01-getting-started/                 # First steps for new developers
+│   ├── 01-prerequisites.md
+│   └── 02-setup-and-run.md
+├── 02-architecture/                    # Architecture documentation
+│   ├── 01-overview.md
+│   ├── 02-module-structure.md
+│   ├── 03-event-system.md
+│   └── 04-shared-components.md
+├── 03-development-workflow/            # Development guides
+│   └── 05-database-migrations.md
+├── 04-guides/                          # How-to guides
+│   ├── 01-extending-the-api.md
+│   └── 02-working-with-email-templates.md
+├── 05-testing/                         # Testing documentation
+│   ├── README.md
+│   ├── 01-test-plan.md
+│   ├── 02-blackbox-testing.md
+│   ├── 03-unit-testing.md
+│   └── 04-frontend-testing.md
+└── 06-deployment/                      # Deployment instructions
+    └── README.md
+```
+
+### Content Migration
+
+The following legacy documentation files were migrated to the new structure:
+
+1. `backend/MODULAR_MONOLITH_IMPLEMENTATION.md` → `docs/02-architecture/`
+2. `backend/EVENT_SYSTEM.md` → `docs/02-architecture/03-event-system.md`
+3. `backend/EXTENDING_ARCHITECTURE.md` → `docs/04-guides/01-extending-the-api.md`
+4. `backend/BLACKBOX_TESTS.md` → `docs/05-testing/02-blackbox-testing.md`
+5. `backend/TEST_PLAN.md` → `docs/05-testing/01-test-plan.md`
+6. `development.md` → `docs/01-getting-started/`
+7. `backend/app/alembic/README_MODULAR.md` → `docs/03-development-workflow/05-database-migrations.md`
+
+### Cleanup
+
+After confirming successful migration, all redundant documentation files were removed:
+
+1. `backend/EVENT_SYSTEM.md`
+2. `backend/EXTENDING_ARCHITECTURE.md`
+3. `backend/MODULAR_MONOLITH_IMPLEMENTATION.md`
+4. `backend/BLACKBOX_TESTS.md`
+5. `backend/TEST_PLAN.md`
+6. `development.md`
+7. `backend/app/alembic/README_MODULAR.md`
+
+### Code Updates
+
+- Updated outdated "transition" comments in backend/app/core/db.py to reflect the current architecture
+
+## Results
+
+The documentation is now:
+
+1. **Better organized** - Information is grouped logically and progressively
+2. **More maintainable** - Each document has a clear purpose and scope
+3. **More accessible** - New developers can follow a clear path through the documentation
+4. **More comprehensive** - Additional documentation was created for areas that were previously undocumented
+5. **More consistent** - Uniform style and formatting across all documentation
+
+## Conclusion
+
+The documentation reorganization significantly improves the project's maintainability and developer experience by providing clear, well-structured information about all aspects of the application.