feat: add new autofill environment section on automatic issues

[Benebo7]

Summary

Auto-fills an Environment line in the GitHub issue body generated by
the "Report Issue", so maintainers can tell at a glance whether
a report came from SurfSense server or a self-hosted install.

What it does

• Adds detectEnvironment() to lib/env-config.ts, inferring the
  deployment from window.location.hostname:
  • surfsense.com and *.surfsense.com → SurfSense Cloud
  • everything else → self-hosted
• Both issue builders now include an - **Environment:** … line:
  • lib/error-toast.ts (buildIssueUrl — the in-app error toast)
  • app/global-error.tsx (buildBasicIssueUrl — the global error boundary)

Inferred from the hostname, so it needs no configuration from the
operator and adds no build/runtime env var.

Testing

1. Run a self-hosted stack, trigger an error, click Report Issue →
   the opened GitHub form shows - **Environment:** self-hosted.
2. On surfsense.com (or a *.surfsense.com subdomain), the same flow
   shows - **Environment:** SurfSense Cloud.
3. Trigger the full-page error boundary to confirm the global error path
   also includes the field.

Note

There are many issues reported by the "Report issue" button that the user don't
provide details, so probably this will help someway on providing few more info of user's env.

High-level PR Summary

This PR automatically adds environment information to GitHub issue reports generated by the application's error reporting features. It introduces a detectEnvironment() function that infers whether the app is running on SurfSense Cloud (official domain) or self-hosted based on the hostname, and includes this information in both the error toast issue builder and the global error boundary issue builder. This helps maintainers quickly identify the deployment context when users report issues without needing any manual configuration or build-time environment variables.

⏱️ Estimated Review Time: 5-15 minutes

💡 Review Order Suggestion

Order	File Path
1	surfsense_web/lib/env-config.ts
2	surfsense_web/lib/error-toast.ts
3	surfsense_web/app/global-error.tsx

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