Implement CSV export endpoint with streaming support

[dumbdevss]

• Updated GET /api/streams/export.csv to match acceptance criteria
• Added all required columns: id, sender, recipient, asset, totalAmount, vestedAmount, claimedAmount, status, startAt, durationSeconds, createdAt
• Implemented all filters from list endpoint: status, sender, recipient, asset, assetCode, q, minAmount, maxAmount, include_archived
• Added streaming support for large exports using res.write() instead of building entire CSV in memory
• Proper CSV escaping for Excel/Sheets compatibility (handles commas, quotes, newlines)
• Updated Swagger documentation with complete parameter list and response schema
• Updated integration tests to verify new columns and additional filters
• Removed caching for export endpoint to ensure fresh data on large exports

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Commit Type

• feat: A new feature
• fix: A bug fix
• docs: Documentation only changes
• style: Changes that do not affect the meaning of the code (formatting, etc.)
• refactor: A code change that neither fixes a bug nor adds a feature
• perf: A code change that improves performance
• test: Adding missing or correcting existing tests
• build: Changes affecting the build system or external dependencies
• ci: Changes to CI/CD configuration files and scripts
• chore: Other changes that don't modify src or test files
• revert: Reverts a previous commit

Breaking change? (If yes, add BREAKING CHANGE in the commit footer)

• Yes — this contains a breaking change
• No

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What changed

Testing done

Related issues

Closes #

Checklist

• I used the correct commit type (see above) for the squashed commit message.
• I kept the change focused on the related issue.
• I added or updated tests where useful.
• I updated documentation where behavior changed.
• I verified the app still builds or explained why verification was skipped.
• My commits follow Conventional Commits (enforced by commitlint).

closes #702

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