Document the bridges API contract and errors

[mikewheeleer]

Document bridges

Description

bridges's API contract isn't documented. This issue adds a reference.

Requirements and context

• Repository scope: StableRoute-Org/Stableroute-backend only.
• Add docs/bridges-api.md describing the bridges endpoints, params, responses, and error codes.
• Keep accurate to the routes.
• Link from the docs index.

Suggested execution

• Fork the repo and create a branch
• git checkout -b docs/bridges-91-api
• Implement changes
  • Write code in: the relevant module.
  • Write comprehensive tests in: cover the new behaviour and edge cases.
• Test and commit

Test and commit

• Run npm run lint, npm test, and npm run build.
• Cover edge cases: n/a — verify against routes.
• Include the full test output in the PR description.

Example commit message

docs(bridges): document API contract

Guidelines

• Minimum 95 percent test coverage for impacted modules.
• Clear, reviewer-focused documentation.
• Timeframe: 96 hours.

Community & contribution rewards

• 💬 Join the StableRoute community on Discord: https://discord.gg/37aCpusvx
• ⭐ This is a GrantFox OSS / Official Campaign task and may be rewarded. When your PR is merged you'll be prompted to rate the project — a 5-star rating is much appreciated.