Add initial MVP documentation for DMARQ platform, detailing backend architecture, frontend implementation, and deployment structure

backend/requirements.txt

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+fastapi>=0.96.0
+uvicorn>=0.22.0
+sqlalchemy>=2.0.0
+pydantic>=2.0.0
+pydantic-settings>=2.0.0
+python-jose[cryptography]>=3.3.0
+passlib[bcrypt]>=1.7.4
+python-multipart>=0.0.6
+fastapi-users[sqlalchemy]>=12.0.0
+alembic>=1.11.0
+pytest>=7.3.1
+pytest-asyncio>=0.21.0
+httpx>=0.24.1
+pytest-cov>=4.1.0
+psycopg2-binary>=2.9.6
+imap-tools>=1.0.0
+defusedxml>=0.7.1
+dynaconf>=3.1.12
+python-dotenv>=1.0.0
+tenacity>=8.2.2
+apprise>=1.4.5
+dnspython>=2.3.0
+email-validator>=2.0.0
+lxml>=4.9.2
+zipfile36>=0.1.3
+aiosmtplib>=2.0.2
+jinja2>=3.1.2