Fix hard-coded workspace path in verify_setup.sh

[Copilot]

The verification script used /workspaces/flai-workshop-github-copilot-800/octofit-tracker/backend, breaking portability across Codespaces and local environments.

Changes

• Derive backend path relative to script location using SCRIPT_DIR
• Script now works from any working directory or repository clone

# Before
cd /workspaces/flai-workshop-github-copilot-800/octofit-tracker/backend

# After
SCRIPT_DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
cd "${SCRIPT_DIR}/octofit-tracker/backend"

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