style: format files

[JacobLinCool]

Add GCP support for object storage.

• GCP Client Initialization: Initialize GCP client using @google-cloud/storage in src/lib/server/object-storage.ts.
• GCP Upload Function: Create upload_object_gcp function to handle GCP object uploads in src/lib/server/object-storage.ts.
• Conditional Upload: Update upload_object function to conditionally use GCP or Cloudflare R2 based on configuration in src/lib/server/object-storage.ts.
• API Route Update: Update POST handler in src/routes/api/stt/+server.ts to use upload_object_gcp if GCP is configured.
• Environment Variables: Add GCP-related environment variables (GCP_PROJECT_ID, GCP_BUCKET_NAME, GCP_KEY_FILENAME) to .env.example.

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src/lib/server/object-storage.ts:84

• The error message 'Invalid file type' is unclear. It should be more descriptive, such as 'Unsupported file type provided for upload'.

throw new Error('Invalid file type');