Fix tokens API documentation

[findolor]

Summary

• document GET /v1/tokens as a raw array of token objects in OpenAPI instead of ["string"]
• update the tokens mdBook page to match the existing response contract, including lowercase isin and sanitized network metadata
• fix the smoke check to validate the root response is an array

Context

GET /v1/tokens already returns a raw JSON array for customers. This keeps that runtime contract intact and only cleans up the generated/API-facing documentation around it.

Closes RAI-479

Validation

• Not run locally per request; CI should cover compile/static validation.

[linear-code]

RAI-479

[coderabbitai]

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: ed36626f-bb16-4913-8df9-85061e1a14ca

📥 Commits

Reviewing files that changed from the base of the PR and between 0875f73 and 0f99787.

📒 Files selected for processing (3)

• docs/src/tokens.md
• scripts/smoke.sh
• src/routes/tokens.rs

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feature/rai-479-api-documentation-cleanup

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[findolor]

• Fix tokens API documentation #112 👈 (View in Graphite)
• main

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