fix: registration workflow and docker compose setup

[Pranav-d33]

This PR addresses local development environment setups and resolves blockages in the user registration workflow. It introduces necessary fixes to allow development stacks to run end-to-end without being blocked by misconfigured database credentials or mock-only configurations.

Changes

• Docker Compose: Switched dashboard image configuration in docker-compose.dev.yml to a local developer build target and defaulted the DASHBOARD_SERVICE_PORT to 8081 to handle empty environment variables gracefully.
• Login Component & Registration Page: Patched form inputs and the state management mappings in src/dashboard/src/components/Login/ and src/dashboard/src/pages/User/Login.js to correctly propagate values to registration endpoints.
• Mock Data: Disabled default dashboard mocks in src/dashboard/config/config.js to ensure the UI communicates with the actual live django backend service during integration tests.
• Package & Dependency Locks: Updated root and dashboard locks to ensure package compatibility.

Verification

• Tested locally by booting the dev environment via make commands.
• Verified that registering an organization no longer fails due to missing field mappings or backend communications.

[Pranav-d33]

#818