Dev

[Amanbig]

This PR enhances the ML Core platform across three areas:

Dataset Analytics UX
Enhanced the dataset statistics sidebar to include comprehensive descriptive statistics (count, mean, std, min, 25%, 50%, 75%, max) for every numeric column, and added a Pearson correlation heatmap with colour-coded cells (green = positive, red = negative) that adapts to both light and dark modes. The backend now computes df.corr() and exposes it via the dataset metadata pipeline.

Model Workflow UX
Migrated Train, Retrain, and Predict interfaces from blocking Dialog overlays to persistent Sheet sidebars. Added a searchable checkbox grid for feature selection and refactored PredictInputs into a tabular list that gracefully scales to large feature counts.

Deployment Controls
Added three new environment variables (DISABLE_SIGNUP, DEFAULT_ADMIN_EMAIL, DEFAULT_ADMIN_PASSWORD) to support locked-down Docker deployments. When set, the server auto-seeds an admin user on first boot and blocks public registration at the API level. The client fetches GET /api/auth/config on mount and hides the Sign Up tab automatically — no client-side config needed.

Updated all three READMEs (root, server, client) to document the new features and environment variables.

Fixes # (issue)

#4

Type of change

• New feature (non-breaking change which adds functionality)
• This change requires a documentation update

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How Has This Been Tested?

1. Dataset stats — Uploaded a CSV with numeric columns; verified all 8 stat columns render correctly in the sidebar table.
2. Correlation heatmap — Verified green/red colour gradients scale with correlation magnitude; checked tooltip shows 3-decimal precision on hover; confirmed readability in both light and dark modes.
3. DISABLE_SIGNUP — Set DISABLE_SIGNUP=True in .env, restarted server; confirmed POST /api/auth/signup returns 403 and the Sign Up tab disappears from the UI on page load.
4. Default admin seeding — Set DEFAULT_ADMIN_EMAIL + DEFAULT_ADMIN_PASSWORD; confirmed server logs Seeding default admin user on first boot and skips it on subsequent restarts (idempotent).
5. Linting — uv run ruff check src → All checks passed. npm run lint → 0 errors, 0 warnings.

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Checklist

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• Any dependent changes have been merged and published in downstream modules