Input size limits: JSON body and URL length

[greatest0fallt1me]

Description

Configure express.json limit and server max header size; reject oversized payloads early.

Requirements and context

• Defaults documented.
• 413 response shape consistent.

Suggested execution

• Fork the repository and create a branch (example below).
• Implement changes in StreamPay-Backend (TypeScript / Express per package.json).
• Keep the service secure, tested, and documented; prefer small, reviewable PRs.

git checkout -b chore/http-size-limits

Implementation targets

• src/index.ts middleware config.

Tests and validation

• Tests with oversized JSON body return 413.

• Run npm test and npm run lint in StreamPay-Backend.

• Cover edge cases; include test output and brief security notes in the PR description.

Guidelines

• Target minimum 95% test coverage on new or changed backend code (or justify gaps).
• Clear documentation (OpenAPI / README / inline docs as specified).
• Timeframe: 96 hours from assignment.

Example commit message

chore(backend): HTTP body and header size limits

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