fix(docker): forward OPENROUTER_API_KEY into the self-host container

[Nordalux]

Problem

OPENROUTER_API_KEY is documented as the key that unlocks the AI features on a self-hosted install:

• .env.example: "Optional in self-hosted modes. Required if you want AI features like SAM, the in-app SEO agent."
• src/routes/_app/help/openrouter-api-key.tsx — a whole in-app help page for obtaining and setting it.
• src/client/features/sam/SamSetupGate.tsx — tells the user to set the OPENROUTER_API_KEY environment variable and restart.

Under Docker none of that has any effect. Compose only forwards the keys listed under environment: in compose.yaml, and this one was not listed. SamChatAgent.ts:110 calls getEnvValueSync(this.env, "OPENROUTER_API_KEY"), gets nothing, and throws OPENROUTER_API_KEY is required for the SAM agent — so the user follows the in-app instructions, restarts, and SAM stays broken with no indication why.

Change

Add the passthrough next to the existing optional Google Search Console keys, using the same ${VAR:-} form so it stays optional.

Verification

With a .env containing OPENROUTER_API_KEY=sk-or-test123:

# main
$ docker compose -f compose.yaml config | grep OPENROUTER
(no output)

# this branch
$ docker compose config | grep OPENROUTER
      OPENROUTER_API_KEY: sk-or-test123

pnpm ci:check passes.

Docs

SELF_HOSTING_DOCKER.md said Compose "passes .env values into the container", which reads as though any key in .env arrives in the container — the assumption that makes this bug easy to miss. Corrected to say it forwards the keys compose.yaml lists, and added OPENROUTER_API_KEY to the optional env values list.

Note

#115 adds CHAT_BASE_URL for local/OpenAI-compatible chat models. If that lands, it will need the same passthrough line to work under Docker — happy to add it here or leave it to that PR, whichever the maintainers prefer.

[sorcerai]

Reviewed exact current diff. OPENROUTER_API_KEY is forwarded without logging or changing defaults, and the Docker documentation now matches Compose behavior.

[sorcerai]

Integration note: #52 and this PR both touch compose.yaml and docs/SELF_HOSTING_DOCKER.md; merging either second conflicts. Safest order is #52 first, then rebase this small PR. While rebasing, please take up your offer from the PR body and add CHAT_BASE_URL passthrough for #115 so local/OpenAI-compatible chat also works under Docker.