feat: add configurable host binding for server and Vite dev server

[webdevcody]

Fixes #536

Summary

Adds configurable host binding for both the backend server and Vite dev server. The hostname can now be configured via the HOST environment variable, defaulting to 0.0.0.0 to listen on all network interfaces.

Changes

• Added HOST environment variable (default: 0.0.0.0) to allow binding to specific network interfaces
• Updated server to listen on configurable host instead of hardcoded localhost
• Updated Vite dev server to respect HOST environment variable
• Enhanced server startup banner to display listening address
• Updated .env.example and CLAUDE.md documentation

Usage

# Listen on all interfaces (default)
npm run dev

# Listen on localhost only
HOST=127.0.0.1 npm run dev

# Listen on specific IP
HOST=192.168.1.100 npm run dev

🤖 Generated with Claude Code

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[gemini-code-assist]

Summary of Changes

Hello @webdevcody, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request significantly improves the network configuration flexibility of the application by allowing users to specify the host binding for both the backend and Vite development servers via a new HOST environment variable. This change moves from a restrictive localhost binding to a more versatile 0.0.0.0 default, which is crucial for deployments in environments like Docker or for accessing the application from different machines on a network. The update also includes clearer server startup messages and comprehensive documentation for the new configuration.

Highlights

• Configurable Host Binding: Introduced a configurable HOST environment variable for both the backend and Vite dev servers, defaulting to 0.0.0.0 for broader network accessibility.
• Server Binding Update: Updated the backend server to bind to the specified HOST instead of a hardcoded localhost.
• Enhanced Server Startup Banner: Enhanced the server startup banner to clearly display the address the server is listening on.
• Documentation Updates: Updated relevant documentation (.env.example, CLAUDE.md) to reflect the new HOST configuration option.

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[gemini-code-assist]

Code Review

This pull request introduces a configurable host binding for both the backend server and the Vite dev server via the HOST environment variable. The changes are well-implemented and include updates to documentation and example files. My main feedback is a suggestion to improve the handling of IPv6 addresses in the server startup banner to ensure the generated URLs are always valid.

[gemini-code-assist]

The logic for hostDisplay doesn't correctly handle IPv6 addresses for URL formatting in the startup banner. This can lead to broken links.

1. The "listen on all" IPv6 address :: is not mapped to localhost.
2. Other IPv6 addresses (e.g., ::1) are not wrapped in square brackets, which is required for URLs (e.g., http://[::1]:3008).

The suggested code fixes the first point. For a more complete solution, consider also handling the bracketing for all IPv6 addresses.

Suggested change

	const hostDisplay = host === '0.0.0.0' ? 'localhost' : host;
	const hostDisplay = host === '0.0.0.0' || host === '::' ? 'localhost' : host;