Authenticate the Fluxions websocket

[coval-cale]

Add auth to fluxions call so that we can use more credits

Greptile Summary

Adds authenticated Fluxions TTS websocket connections so benchmark runs can use account credits.

• Adds FLUXIONS_API_KEY to environment-backed settings and the provider-key registry.
• Requires the key when constructing the Fluxions provider and sends it as a bearer authorization header during the websocket handshake.
• Updates Fluxions tests to cover the authorization header and missing-key behavior.

Confidence Score: 5/5

The PR appears safe to merge with Fluxions authentication consistently wired through configuration, provider construction, and websocket handshake tests.

The changed provider uses the repository's established secret configuration and websocket header conventions, while model eligibility prevents the absent arena deployment key from affecting current arena checks.

_{Reviews (1): Last reviewed commit: "Authenticate the Fluxions websocket" | Re-trigger Greptile}

Context used:

• Knowledge Base — Runner Orchestration

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Review details

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro Plus

Run ID: 5cfab0a7-8091-4d6a-8b95-fa4deb38d83a

📥 Commits

Reviewing files that changed from the base of the PR and between 0799052 and e447911.

📒 Files selected for processing (6)

• .env.example
• runner/src/coval_bench/config.py
• runner/src/coval_bench/providers/tts/fluxions.py
• runner/src/coval_bench/registries/models.py
• runner/src/coval_bench/registries/provider_keys.py
• runner/tests/providers/tts/test_fluxions.py

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