Add an in-process mesio downloader using the rust-srec mesio-engine. Introduces crates/biliup-cli/src/server/core/downloader/mesio.rs implementing FLV/HLS pull, timestamp fixes, keyframe indexing, and size/duration-based segmentation with pipeline_common, flv_fix and hls_fix. Wire Mesio into downloader enum/runtime and add UI options and public config docs. Update crates/biliup-cli/Cargo.toml and workspace Cargo.toml/Cargo.lock to include new dependencies and bump version to 1.2.5. Include tests for protocol selection, pipeline behavior and an e2e FLV download. Small helper changes: config enum docs and segment handling.
ForgQi
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