Keep the dgemma request's redirects manual

[myxamediyar]

What

• The request to the image-capable service used redirect: "error". The Workers runtime has no such mode and throws a TypeError on the option, so in production every dgemma request failed before leaving the Worker and the route answered 503 dgemma_unavailable. The unit tests run under bun, which accepts the option, so they did not catch it.
• The request now uses redirect: "manual": a 3xx comes back as a response and is answered as an outage, which is what the runtime's own error message recommends. Nothing is ever followed.
• A test pins the option on the outgoing request and the 3xx mapping.

Checks

• npx tsc --noEmit clean; test/dgemma.test.ts 8 pass.

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Reviewing files that changed from the base of the PR and between e7f8181 and 8c60a1b.

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• src/dgemma.ts
• test/dgemma.test.ts

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