[Backend] sandboxMiddleware trusts client-supplied X-Sandbox-Mode header even when sandbox mode is globally disabled path is untested

[grantfox-oss]

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Why this matters

sandboxMiddleware only skips sandbox detection when config.enabled is false, but there is no test asserting that a malicious client cannot flip req.sandbox to true by sending X-Sandbox-Mode when SANDBOX_MODE_ENABLED is unset.

Acceptance criteria

• Add a unit test that calls sandboxMiddleware with config.enabled=false and an X-Sandbox-Mode header set
• Assert req.sandbox and req.sandboxMode remain false

Files to touch

• backend/src/middleware/sandbox.middleware.ts
• backend/src/config/sandbox.ts

Out of scope

Does not change the middleware's behavior, test-only unless a gap is found.

[Peolite001]

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[zoffunjunior381-jpg]

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[grantfox-oss]

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@zoffunjunior381-jpg's PR #1133 was approved and merged by @ogazboiz.

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