Refactor architecture documentation and enhance security features

- Updated architecture constraints documentation to include detailed sections on technical, organizational, regulatory, environmental, and performance constraints.
- Created separate markdown files for each type of constraint for better organization and clarity.
- Revised the architecture scope section to provide a clearer overview of the system's key areas.
- Enhanced the solution strategy documentation with detailed explanations of the client-server architecture, technology choices, trade-offs, and future considerations.
- Added comprehensive descriptions of backend and frontend components, middleware, and utilities in the architecture documentation.
- Migrated UI, templates, and styling notes to a dedicated section for better structure.
- Updated requirements.txt to include missing dependencies.
- Refactored user authentication logic in the users.py and security.py files to improve code organization and maintainability, including the integration of OAuth2 password bearer token handling.

docs/architecture/03_scope/03_01_architecture_scope.md

@@ -0,0 +1,26 @@
+---
+title: '03 — Architecture Scope'
+description: 'Key areas encompassed by the architecture.'
+status: draft
+---
+
+# Architecture Scope
+
+The architecture encompasses the following key areas:
+
+1. **Data Ingestion**: Mechanisms for collecting and processing data from various sources.
+2. **Data Storage**: Solutions for storing and managing historical and real-time data.
+3. **Simulation Engine**: Core algorithms and models for scenario analysis.
+   3.1. **Modeling Framework**: Tools for defining and managing simulation models.
+   3.2. **Parameter Management**: Systems for handling input parameters and configurations.
+   3.3. **Execution Engine**: Infrastructure for running simulations and processing results.
+   3.4. **Result Storage**: Systems for storing simulation outputs for analysis and reporting.
+4. **Financial Reporting**: Tools for generating reports and visualizations based on simulation outcomes.
+5. **Risk Assessment**: Frameworks for identifying and evaluating potential project risks.
+6. **Profitability Analysis**: Modules for calculating and analyzing project profitability metrics.
+7. **User Interface**: Design and implementation of the user-facing components of the system.
+8. **Security and Compliance**: Measures to ensure data security and regulatory compliance.
+9. **Scalability and Performance**: Strategies for ensuring the system can handle increasing data volumes and user loads.
+10. **Integration Points**: Interfaces for integrating with external systems and services.
+11. **Monitoring and Logging**: Systems for tracking system performance and user activity.
+12. **Maintenance and Support**: Processes for ongoing system maintenance and user support.