feat: Dual Authentication Mechanism API + NUC

[jcabrero]

After Phase 0 finishes, there will be a transition period where API keys and NUCs may live together. In this PR, we duplicate api and postgres containers and add caddy redirection under /nuc subdomain to that NUC instances. This makes it so that users can choose to connect to nilAI through both NUCs and API keys during the transition period where both NUCs and API Keys are both working.

Furthermore, to make sure both authentication methods remain operational, we modified ci and tests so that both are passed.

[Copilot]

Pull Request Overview

This PR enables a parallel transition period where API key and NUC authentication coexist by duplicating containers, updating routing, and adapting tests and CI to handle both methods.

• Refactored E2E tests to use a unified api_key_getter, disable SSL verification in test clients, and add skips based on AUTH_STRATEGY.
• Enhanced configuration (config.py) with a match on AUTH_STRATEGY to set BASE_URL and token retrieval dynamically.
• Updated Docker Compose and Caddy to include NUC-specific nuc-postgres and nuc-api services with path-based routing, and expanded CI to run tests for both auth strategies.

Reviewed Changes

Copilot reviewed 9 out of 9 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
tests/e2e/test_openai.py	Updated fixtures to call api_key_getter(), added custom HTTP clients with verify=False, and skip markers.
tests/e2e/test_http.py	Switched to api_key_getter(), added verify=False flags, improved assertion messages, and skip markers.
tests/e2e/config.py	Introduced AUTH_STRATEGY, refactored BASE_URL and api_key_getter definitions via match.
scripts/wait_for_ci_services.sh	Added health check logic for the new nilai-nuc-api container.
docker-compose.yml	Added nuc-postgres and nuc-api services, volumes, and healthchecks for NUC support.
docker-compose.dev.yml	Exposed nuc-api and nuc-postgres ports for local development.
caddy/Caddyfile	Configured /nuc and /nuc/* routing to the nuc-api service.
.github/workflows/ci.yml	Installed python3.12-dev, fixed typos, and added separate CI steps for NUC and API key E2E tests.
.env.ci	Adjusted NILAI_GUNICORN_WORKERS and default AUTH_STRATEGY for CI.