chore(deps): 将 dsh peers 升级到 0.1.2-alpha.4 / upgrade dsh peers to 0.1.2-alpha.4

[auto-wood]

Summary

将 @deepseek-ai/dsh-* peer 对齐到 ^0.1.2-alpha.4，以兼容 deepseek-harness dsh-v0.1.2-alpha.4（pre-release）。本轮主要是 peer / lock 对齐；仓库已使用 TypertRemoteService。

Bump @deepseek-ai/dsh-* peers to ^0.1.2-alpha.4 for deepseek-harness dsh-v0.1.2-alpha.4 (pre-release). Peer/lock bump; plugin already uses TypertRemoteService. No new RemoteError / ignorable / peer-trim vs alpha.3.

• NEW: dsh-v0.1.2-alpha.4
• PREV: dsh-v0.1.2-alpha.3
• Compare: deepseek-ai/deepseek-harness@dsh-v0.1.2-alpha.3...dsh-v0.1.2-alpha.4
• Release: https://github.com/deepseek-ai/deepseek-harness/releases/tag/dsh-v0.1.2-alpha.4

Changes

• package.json: dsh peers bumped to ^0.1.2-alpha.4. cordis/schemastery/react unchanged.
• workspace yaml + lockfile refreshed to a single 0.1.2-alpha.4 line.
• README badges updated to 0.1.2-alpha.4.
• No ApiProxy leftovers. RemoteError already in place. No session-projection added. No sqlite session persistence.

Test plan

• peer range includes 0.1.2-alpha.4 and lock is a single alpha.4 line
• typecheck / tests against installed 0.1.2-alpha.4
• settings card still loads provider/model directory via Remote