fix: copy openapi.yaml into Docker production image

[0x-SquidSol]

Summary

• Issue: The Dockerfile never copies openapi.yaml into the production image. The /docs/openapi.yaml endpoint reads it at runtime via fs.readFile("/app/openapi.yaml"), but that file doesn't exist in the container — guaranteed 500 error on the /docs endpoint in production.
• Root cause: Builder stage only copies package.json, lockfiles, tsconfig.json, and src/. Runner stage only copies dist/, node_modules/, package.json. tsc doesn't copy non-TS files. openapi.yaml lives at the project root, outside src/.
• Fix: Add COPY openapi.yaml ./ to the runner stage (1 line).

Path trace

src/routes/docs.ts:14 → join(__dirname, "..", "..", "openapi.yaml")
At runtime: __dirname = /app/dist/routes/
Resolves to: /app/openapi.yaml ← does not exist without this fix

Test plan

• tsc --noEmit passes
• vitest run passes (186/186 tests)
• Docker build: verify /app/openapi.yaml exists in final image
• curl localhost:3001/docs/openapi.yaml returns YAML, not 500

🤖 Generated with Claude Code

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 2d97a60e-4740-434a-a12d-91c774dbec52

📥 Commits

Reviewing files that changed from the base of the PR and between fb94c29 and da8935a.

📒 Files selected for processing (1)

• Dockerfile

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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