Stellar.toml Discoverability Endpoint

[deslawson]

🔗 Related Issue

Closes #15

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🔖 Title

Stellar.toml Discoverability Endpoint

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📝 Description

Added GET /.well-known/stellar.toml via a new StellarTomlController so that Stellar wallets (Lobstr, StellarExpert) can auto-discover StepFi's federation file from the API domain. The endpoint returns a TOML body with org metadata (ORG_NAME, ORG_URL, ORG_GITHUB) and a [[CONTRACTS]] block listing all 4 contract IDs (CREDIT_LINE_CONTRACT_ID, LIQUIDITY_POOL_CONTRACT_ID, REPUTATION_CONTRACT_ID, VENDOR_REGISTRY_CONTRACT_ID) read from ConfigService. Response is cached in-memory with a 1-hour TTL. The route is excluded from the global API prefix and includes Content-Type: text/plain and Access-Control-Allow-Origin: * headers. Full Swagger decorators and a passing e2e test are included.

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🔄 Changes Made

• Created src/modules/health/stellar-toml.controller.ts — new controller exposing GET /.well-known/stellar.toml with org metadata, all 4 contract IDs from ConfigService, in-memory 1-hour cache, and Swagger decorators
• Updated src/modules/health/health.module.ts — registered StellarTomlController in the module's controller list
• Updated src/main.ts — excluded .well-known/stellar.toml from the global API prefix so it's served at root
• Created test/e2e/stellar-toml.e2e-spec.ts — e2e test asserting 200, text/plain content-type, CORS header, and all 4 contract IDs present in body
• Updated context/progress-tracker.md — marked stellar.toml endpoint as completed in the tracker

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Closed #15