Update WebSocket base URLs across environment examples and default config to include the required `/ws` path suffix that the backend WebSocket endpoint expects. Applies to development, test/local, and production environments.
Add Stripe payment integration across the project:
- Add @stripe/stripe-js dependency
- Configure Stripe environment variables (secret key, publishable key, webhook secret) for dev, local, and production environments
- Add Product/Price IDs for monthly, quarterly, and annual subscription tiers
- Extend subscription plan data with voiceMinutesPerDay quotas (30/45/60 minutes per tier)
- Update .gitignore to exclude implementation_plan.md
- Add per-environment AUTH_SECRET (dev/test/prod) for next-auth v4 JWT signing
- Temporarily redirect next start stdout/stderr to LOG_FILE in post-receive hook for server error debugging
- Reorganize env example files into a dedicated env-example/ directory for clarity
- Update .gitignore to ignore env files (with examples now in env-example/)
- Unify CDN credentials (CF_ZONE_ID / CF_API_TOKEN) to be sourced from .env.local in both test and production deploys
- Update git_hooks/post-receive to copy production env example from new location
- Update deploy scripts (pre_release_web.sh, release_web.sh) to copy the appropriate env example into .env.local before building
- Update _deploy_lib.sh purge_cdn_cache to source from .env.local instead of .env
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