Backend
1. controller/channel.go
• Always hydrate `ChannelInfo` from DB in `UpdateChannel`, keeping `IsMultiKey` true so `MultiKeySize` is recalculated.
2. model/channel.go
• getKeys(): accept both newline-separated keys and JSON array (`[ {...}, {...} ]`).
• Update(): reuse new parser-logic to recalc `MultiKeySize`; prune stale indices in `MultiKeyStatusList`.
Frontend
1. pages/Channel/EditChannel.js
• `handleVertexUploadChange`
– Reset `vertexErroredNames` on every change so the “ignored files” prompt always re-appears.
– In single-key mode keep only the last file; in batch mode keep all valid files.
– Parse files, display “以下文件解析失败，已忽略：…”.
• Batch-toggle checkbox
– When switching from batch→single while multiple files are present, show a confirm dialog and retain only the first file (synchronises state, form and local caches).
• On opening the “new channel” side-sheet, clear `vertexErroredNames` to restore error prompts.
Result
• “已启用 x/x” count updates immediately after editing multi-key channels.
• Vertex-AI key upload works intuitively: proper error feedback, no duplicated files, and safe down-switch from batch to single mode.
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