feat(core): honor deploy base in static build

[antfubot]

What & why

Closes #554.

The static DevTools build hardcoded the absolute /__devtools/ mount path, so a snapshot deployed under a subpath (e.g. /ci-build-123456/) redirected the browser to /__devtools/ instead of /ci-build-123456/__devtools/ and failed to load. Setting Vite's base in vite.config.ts had no effect because the static-build code ignored it.

The CLI build command already declared a --base <baseURL> flag, but it was collected into BuildOptions.base and never used.

Change

Thread a deploy base through buildStaticDevTools so the two root-relative URLs it bakes resolve under the subpath:

• the root index.html redirect, and
• the dock-renderer import specifiers.

Wired from both entry points:

• CLI path (vite-devtools build) — activates the existing --base flag.
• Plugin path (vite build) — picks up resolvedConfig.base, so setting base in vite.config.ts now works.

The reference viewer's own assets, connection meta, and RPC dump already resolve relative (./) upstream, so they work under any base. Verified end-to-end: built with --base /ci-build-123456/, served under that subpath, and the SPA redirects correctly and renders with no load-blocking errors.

Scope

This makes the primary DevTools SPA work at a subpath. Full subpath support for the integration sub-panels (Rolldown/Vite/Oxc) is out of scope here: each Nuxt sub-app bakes its own absolute base at its own build time, and the devframe:docks dump carries absolute dock icon/url values whose derivation is owned upstream in @devframes/hub. Those warrant follow-up in the respective packages and upstream.

This PR was created with the help of an agent.

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commit: 7a6a242