feat: Move application server public key to config

[Zyreny]

Issue

The application server's public key was hardcoded, which posed a security risk.

Notice

The public key is now configurable via an environment variable, enhancing security and flexibility.

Dependency

No additional dependencies are introduced with this change.

[gemini-code-assist]

Summary of Changes

Hello @Zyreny, 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 refactors the handling of the application server's public key to enhance security and maintainability. By externalizing the key into a configurable environment variable, it removes a hardcoded sensitive value from the codebase, making the system more robust and easier to manage in different deployment environments.

Highlights

• Security Enhancement: The application server's public key, previously hardcoded, is now configurable via an environment variable (APPLICATION_SERVER_PUBLIC_KEY), mitigating a security risk.
• Configuration Flexibility: The change improves flexibility by allowing the public key to be managed externally, rather than requiring code modifications for updates.

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Changelog

• config.js
  • Added applicationServerPublicKey to the module exports, allowing it to be set via process.env.APPLICATION_SERVER_PUBLIC_KEY with a fallback default value.
• src/components/web-push.js
  • Removed the hardcoded applicationServerPublicKey and replaced it with a reference to process.env.APPLICATION_SERVER_PUBLIC_KEY.
  • Removed a TODO comment related to moving the key to config.
• webpack.config.js
  • Included process.env.APPLICATION_SERVER_PUBLIC_KEY in the webpack.DefinePlugin configuration, ensuring the key is correctly injected into the client-side bundle during compilation.

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