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server: (router) Forward form-data to model server (Fixes #22044) (#22118)

This commit enables the router to forward form-data to model server. Fixes #22044 (enabling to use the /v1/audio/transcriptions in router mode)
- Applied the suggestion from Copilots first comment: using the non-throwing json::parse overload.
Addressed Copilots third comment by extending the files representation to also include filename and content-type
Addressed Copilots fourth comment by making the RNG thread_local
Changed variable body from std::string to std::ostringstream in build_multipart_body as suggested by ngxson in https://github.com/ggml-org/llama.cpp/pull/22118#discussion_r3127099053
Added sanitize_field lambda in build_multipart_body for key, filename and content_type as suggested by ngxson in https://github.com/ggml-org/llama.cpp/pull/22118#discussion_r3127104647
explicitly checking if value/item is string before calling value/item.getstd::string() as requested by ngxson in https://github.com/ggml-org/llama.cpp/pull/22118#discussion_r3127111279
Added double quote to the sanitize lambda and throw on json parse failure

Co-authored-by: Ralph Paßgang ralph@trust-it.de

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