Add JSDoc documentation to all functions and methods

[Copilot]

Organization policy requires docstrings for all functions. Added comprehensive JSDoc documentation across API and frontend codebases.

Changes

API Layer

• Server initialization and database setup functions
• Repository factory functions (createXXXRepository, getXXXRepository) across all 8 repository modules

Frontend Layer

• React component functions (App, navigation, auth, products, admin)
• Context providers and custom hooks (AuthProvider, ThemeProvider, useAuth, useTheme)
• Configuration and utility functions (getBaseUrl, fetchProducts)

Example

/**
 * Gets or creates a singleton instance of SuppliersRepository
 * @param {boolean} isTest - Whether to use test database configuration (default: false)
 * @returns {Promise<SuppliersRepository>} The repository singleton instance
 */
export async function getSuppliersRepository(
  isTest: boolean = false,
): Promise<SuppliersRepository> {

All documentation follows JSDoc standards with parameter types, return values, and error conditions where applicable.

Original prompt

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This section details on the original issue you should resolve

<issue_title>Code lacks documentation</issue_title>
<issue_description>Our organization has a requirement that all functions have docstrings or the language equivalent. Unfortunately, recent updates haven't followed this standard. We need to update the existing code to ensure docstrings (or the equivalent) are included with every function or method.</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Code lacks documentation #2

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