feat: adapt to DSH 0.1.2-alpha.1 (Remote gateway + token auth + MarkdownText labels)

Dual-version compatibility: the plugin now works identically on
0.1.0-rc.8 ~ 0.1.1-rc.2 and 0.1.2-alpha.1 (the latter verified against a
source build of the dsh-v0.1.2-alpha.1 tag: mount smoke 14/14 + aggregate
double-mount; 0.1.1-rc.2 re-verified 14/14).

- MarkdownText: alpha.1 renamed the flat optional `codeLabels` prop to a
  required nested `labels: { code: {copyLabel, copiedLabel}, footnotes }`;
  the old prop alone crashes fence rendering with "reading 'code'". All
  four render sites (mermaid / MarkdownHtml / TextEditor / SideChatView)
  now go through src/client/markdown-labels.tsx (dual-shape object passed
  under both prop names).
- e2e mount lanes speak both host dialects (tests/e2e/host-protocol.ts +
  host.ts, unit-locked by tests/e2e-host-protocol.spec.ts):
  - one-time-token browser auth: the launch URL grep extends past the
    `/?token=` query (truncating at `/` loses the token), goto navigates
    the token URL (browser cookie exchange), and stamped navigations
    pre-seed the context cookie via addCookies — the exchange 303 drops
    sibling query params;
  - Remote gateway: dot endpoints first, slash endpoints on 404 fallback,
    with args keyed by the controller parameter name (workspace/create ->
    {request}, session/list -> {_request}; verified on a live host).
- package.json: drop the @deepseek-ai/dsh-client-runtime peer (package
  removed upstream in alpha.1; zero references in the source — the chunk
  externals entry stays and is resolution-tolerant).
- scripts/e2e-mount.sh: fix a latent set -u crash in the npx fallback
  branch ($DSH_CMD followed by a full-width comma parsed as part of the
  variable name).
- CI pin stays at @deepseek-ai/dsh@0.1.1-rc.2 until alpha.1 publishes to
  npm (comment updated); README/AGENTS document the new contracts.
- Version lockstep bumped to 0.17.1.

src/client/MarkdownHtml.tsx

@@ -19,6 +19,7 @@ import { createElement, type ReactNode } from 'react'
 import DOMPurify from 'dompurify'
 import { MarkdownText } from '@deepseek-ai/dsh-client-ui-primitives'
 import type { ComponentType } from 'react'
+import { markdownTextProps } from './markdown-labels.tsx'
 import { lazyChunkComponent } from './lazy-chunk.tsx'
 import { resolveLocalMediaDest } from './markdown-images.ts'
 import {
@@ -193,7 +194,7 @@ function MarkdownSegment({ text, hasMermaid, media, codeLabels }: MarkdownSegmen
     <div ref={containerRef}>
       {hasMermaid
         ? <LazyMermaidMarkdown text={text} codeLabels={codeLabels} />
-        : <MarkdownText text={text} codeLabels={codeLabels} />}
+        : <MarkdownText {...markdownTextProps(text, codeLabels)} />}
     </div>
   )
 }