auth: static X-API-Key gate; 0.3.0#10
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Enables exposing /single and /multi through ingress while keeping the service protected by a static shared secret. /healthz stays open so k8s probes and external liveness monitors don't need to know the token. - config: new optional `api_token` (env KZ_SCORING_API_TOKEN). Empty = no auth (matches original behaviour; dev-stand and port-forward keep working without headers). - app: HTTP middleware compares X-API-Key against api_token via hmac.compare_digest. /healthz bypasses the gate. - chart: dedicated Secret rendered only when apiToken is set, mounted via envFrom; deployment stays unchanged when auth is off. - tests: 8 new cases covering healthz-open, missing header, wrong token, correct token, /multi mirror, and constant-time compare regression (61 tests total, all green). Not in scope: multi-token / per-caller quotas / rotation. If needed later, this middleware can be extended without breaking callers. Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com> Co-authored-by: multica-agent <github@multica.ai>
Co-authored-by: multica-agent <github@multica.ai>
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Summary
Adds an optional static `X-API-Key` gate so `/single` and `/multi` can be safely exposed via ingress. `/healthz` stays open for k8s probes and external liveness monitors. When `api_token` is empty the middleware is a passthrough — dev-stand and port-forward callers keep working without headers.
Wire-up
Caller shape
```
curl -H "X-API-Key: " "https://kz-scoring.cdp.beelinekz.aggregion.com/single?iin=700205302324\"
```
Test plan
Not in scope
Multi-token, per-caller quotas, rotation. Middleware can grow to handle those without breaking callers.
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