Get quickstart install script

Returns a bash script that signs up for a Fiber API trial and prints your API key.

The one-liner is:

curl -fsSL https://api.fiber.ai/quickstart | bash

The script handles the full flow end to end:

1. Prompts for a work email and OTP (agents run non-interactively with --json).
2. Calls POST /v1/account/send-otp and POST /v1/account/verify-otp.
3. Stores the returned live API key at $HOME/.config/fiber/credentials (mode 0600).
4. Verifies the key with GET /v1/get-org-credits and prints the balance.

No authentication is required to fetch the script. The response is text/x-shellscript, not JSON — pipe it to bash.