docs: add API key auth requirement to /ws/stats in OpenAPI spec

[0x-SquidSol]

Summary

• Issue: GET /ws/stats requires x-api-key header via requireApiKey() middleware, but the OpenAPI spec had no security requirement. Clients following the spec would receive an undocumented 401.
• Fix: Adds securitySchemes component and security + 401 response to the /ws/stats operation.

Changes

• Added components.securitySchemes.ApiKeyAuth (apiKey in header, name: x-api-key)
• Added security: [ApiKeyAuth: []] to /ws/stats GET operation
• Added 401 response with example error message
• Updated endpoint description to note auth requirement

Test plan

• vitest run passes (186/186 tests)
• Verified requireApiKey() checks x-api-key header in src/middleware/auth.ts

🤖 Generated with Claude Code

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: b0af6604-bca6-41b0-846a-9e028e24ad29

📥 Commits

Reviewing files that changed from the base of the PR and between fb94c29 and ccc19de.

📒 Files selected for processing (1)

• openapi.yaml

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