feat: add documentation and automation for GCP project recreation

[allenhutchison]

This PR adds documentation and scripts to allow users to recreate the Google Cloud Platform project required for this extension.

Changes:

• Added docs/GCP-RECREATION.md with a detailed step-by-step guide.
• Added scripts/setup-gcp.sh to automate API enablement and infrastructure deployment.
• Refactored AuthManager to support configurable CLIENT_ID and CLOUD_FUNCTION_URL via environment variables (WORKSPACE_CLIENT_ID, WORKSPACE_CLOUD_FUNCTION_URL).
• Updated README.md with a deployment section.

[gemini-code-assist]

Summary of Changes

Hello @allenhutchison, 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 introduces the capability for users to deploy and manage their own Google Cloud Platform infrastructure for the extension. It provides a detailed, step-by-step guide and an accompanying automation script to streamline the setup process, alongside necessary code modifications to allow the extension to connect to these user-provisioned cloud resources. This significantly enhances the flexibility and self-sufficiency for users who wish to host their own backend services.

Highlights

• GCP Recreation Guide: A new comprehensive guide (docs/GCP-RECREATION.md) has been added, detailing the steps to recreate the Google Cloud Platform project and infrastructure required for the extension, including a clear explanation of the hybrid OAuth flow.
• Automated Setup Script: A new bash script (scripts/setup-gcp.sh) automates the provisioning of GCP resources, such as enabling necessary APIs, setting up Secret Manager for the OAuth client secret, and deploying the Cloud Function.
• Configurable Infrastructure Endpoints: The AuthManager has been refactored to dynamically load the CLIENT_ID and CLOUD_FUNCTION_URL from environment variables (WORKSPACE_CLIENT_ID, WORKSPACE_CLOUD_FUNCTION_URL) via a new config.ts utility, allowing users to easily point the extension to their self-hosted GCP infrastructure.
• Updated Deployment Instructions: The README.md now includes a dedicated "Deployment" section, directing users to the new GCP recreation guide for self-hosting instructions.

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[gemini-code-assist]

Code Review

This pull request significantly improves the deployment experience by providing detailed documentation and an automation script for setting up the GCP infrastructure. The refactoring of AuthManager to use configurable CLIENT_ID and CLOUD_FUNCTION_URL via environment variables is a great step towards making the extension more flexible and easier to self-host. The new config.ts file centralizes configuration loading effectively. Overall, these changes greatly enhance the maintainability and deployability of the project.