chore(sync): re-base the fork onto upstream dsh-better-sidebar v0.19.1

The fork was pinned at upstream v0.18.0. That is the entire reason the window
ran TWO sidebars and TWO near-identical panel toggles: DSH 2.0.10 ships its own
right sidebar (@deepseek-ai/dsh-client-ui-sidebar-right), and upstream only
adopted it in v0.19.0-alpha.1 — which arrived after our fork point. v0.19.1 is
also the one upstream line whose support range actually matches our host
(engines.dsh >=0.1.5-rc.1, 14 DSH peers ^0.1.5-rc.1, host = 0.1.5-rc.2), so it
is the only tag the host's startup precheck accepts.

What upstream v0.18.0 → v0.19.1 brings
- src/client/native/{index,surface,tab-adapter}.tsx: every tab the plugin can
  draw becomes an OFFICIAL native tab type + body, and an external plugin's
  descriptor registered later gets its native type too. This is what retires
  the fork's own right panel — and with it the duplicate toggle cluster
  (`toggleCluster` is gone from v0.19.1).
- native tab-chip icons via the `sidebar.right.pane.tab.title` seat, coloured
  built-in tab icons, file/folder glyphs from DSH's own `FileTypeIcon`.
- guide descriptions (DSH renders them while the guide lists <= 4 entries),
  tab bodies that fill the panel, and the 0.1.5-rc.2 adaptation work we were
  carrying by hand (peer/devDep pinning, primitives' transitive devDeps).

How the sync was done
Rebuilt the tree from the v0.19.1 tag rather than resolving 53 conflicted
files: our v0.18.0 delta was measured first and is only (a) one mechanical
rename `dsh-better-sidebar` -> `dsh-apes-sidebar` and (b) ten real edits. So:
tag tree + rename (scoped: code/config/scripts/tests/README, while the 46
historical docs/plans records and switch.sh's upstream package name stay
untouched) + re-applied deltas + our apes module.

Fork deltas re-applied on the new base
- src/client/apes/ (icons / locales / tabs): the three apes:* information-layer
  tabs (agents / apps / profile), registered through the same BetterSidebarService
  as the builtins — which is exactly why they now ride upstream's native adapter
  into the official sidebar for free.
- identity: package.json (name/version 1.2.0/description/forkedFrom), dsh.plugin.json
  (id/version), SIDEBAR_SERVICE_VERSION 1.2.0, README fork notice,
  docs/external-plugin-guide.md.
- scripts/switch.sh + the pnpm switch* scripts (apes <-> upstream two-line switch).
- tests/apes-tabs.spec.ts (unescaped: it starts from the v0.19.1 base).

Dropped
- the Phase A native-registration spike (`apes/native-tabs.tsx` + its spec): it
  re-derived by hand exactly what upstream's native layer already does — the
  hand-written bridge is dead weight now, and v0.19.1's own e2e/jsdom lanes
  cover the same seat contract far better.
- the unused apesProfileGuideDesc key and the two package.json.bak.* backups.

Verified on the new base: typecheck clean; build clean; 1351 passed / 9 skipped
(128 files), up from 1255 on the old base.

scripts/e2e-mount.sh

@@ -1,6 +1,6 @@
 #!/usr/bin/env bash
 # =============================================================================
-# dsh-better-sidebar 挂载冒烟编排（CI + 本地）：
+# dsh-apes-sidebar 挂载冒烟编排（CI + 本地）：
 #
 #   1. 用官方 CLI 把 npm 打包产物（tarball）真实挂载进一个全新 scratch
 #      profile（`dsh plugin --profile web add file:<tarball>`，触发
@@ -14,7 +14,7 @@
 #
 # 环境变量（均可省略）：
 #   DSH_CMD        dsh 命令；缺省 PATH 上的 `dsh`，回退 npx 拉官方包
-#   TARBALL        插件 tarball；缺省仓库根 dsh-better-sidebar-*.tgz（须已 pack）
+#   TARBALL        插件 tarball；缺省仓库根 dsh-apes-sidebar-*.tgz（须已 pack）
 #   PORT           固定端口（默认 0 = OS 分配，从日志解析 URL）
 #   DSH_HOME_BASE  覆盖 scratch 根目录（默认系统临时目录）。脚本始终在其下
 #                  新建本调用拥有的独立子目录，只写入/删除该子目录；调用方
@@ -44,7 +44,7 @@ e2e_require_cmd pnpm "dsh plugin 转发给 pnpm"
 
 e2e_resolve_dsh_cmd
 
-e2e_resolve_tarball || die "找不到 tarball（TARBALL 或 \$ROOT/dsh-better-sidebar-*.tgz）——先运行 pnpm build && pnpm pack"
+e2e_resolve_tarball || die "找不到 tarball（TARBALL 或 \$ROOT/dsh-apes-sidebar-*.tgz）——先运行 pnpm build && pnpm pack"
 TARBALL="$(cd "$(dirname "$TARBALL")" && pwd)/$(basename "$TARBALL")"
 say "tarball: $TARBALL"
 
@@ -72,18 +72,18 @@ e2e_write_profile "$PROFILE_DIR"
 say "执行 dsh plugin --profile web add file:$TARBALL ..."
 $DSH_CMD plugin --profile web add "file:$TARBALL"
 
-# 步骤 3：校验挂载生效（dsh.profile.bundles 含 dsh-better-sidebar）
+# 步骤 3：校验挂载生效（dsh.profile.bundles 含 dsh-apes-sidebar）
 if ! node -e '
   const fs = require("fs");
   const p = JSON.parse(fs.readFileSync(process.argv[1], "utf8"));
   const bundles = p.dsh?.profile?.bundles ?? [];
-  process.exit(bundles.includes("dsh-better-sidebar") ? 0 : 1);
+  process.exit(bundles.includes("dsh-apes-sidebar") ? 0 : 1);
 ' "$PROFILE_DIR/package.json"; then
-  warn "dsh-better-sidebar 未出现在 dsh.profile.bundles 中——挂载未注册"
+  warn "dsh-apes-sidebar 未出现在 dsh.profile.bundles 中——挂载未注册"
   cat "$PROFILE_DIR/package.json"
   exit 1
 fi
-say "挂载已注册：dsh.profile.bundles 包含 dsh-better-sidebar"
+say "挂载已注册：dsh.profile.bundles 包含 dsh-apes-sidebar"
 
 # 步骤 4：启动 dsh web（--port 0 = OS 分配，避免端口冲突；keyless 可起）
 say "启动 dsh web（port=${PORT}）..."