fix(web): remove config-load warning filter, fix root cause (#1491) (#1494)

The `UNRESOLVED_IMPORT` warnings that `quiet-config-warnings.mjs` suppressed
no longer occur, so the filter (and the build-time `onwarn` suppressions for
the same three deps) are removed.

Root cause: Vite's config bundler (Rolldown) statically walks the node-only
dev backend (`core/mcp/remote/node/server.ts`) when it loads `vite.config.ts`,
reaching `chokidar`, `atomically`, and `@napi-rs/keyring`. `core/` has no
node_modules of its own, so at config-bundle time those deps resolve from
`core/`'s parent chain — the repo-root `node_modules`. Before #1452 the deps
lived only under `clients/web/node_modules` (a sibling, off the resolution
chain), so Rolldown emitted `UNRESOLVED_IMPORT`. #1452 declared them in the
repo-root `package.json` (for the CLI/TUI/launcher, which consume core/'s node
code), installing them at the repo root and making them resolvable. Verified
by hiding the root copy: the warning returns; restore it and the dev/build
startup is clean.

A dynamic import of the backend does not help — Rolldown follows dynamic
imports during config bundling too. The fix is the deps being resolvable, so
the suppression is just removed and the invariant is documented in
`vite.config.ts`.

- Remove `clients/web/server/quiet-config-warnings.mjs` + `.d.mts` and its test
- Restore the `dev` script to plain `vite` (drop the `--import` hook)
- Remove the now-dead `build.rollupOptions.onwarn` UNRESOLVED suppressions
  (never fire: the Hono plugin is `apply: 'serve'`, out of the build graph)
- Document why config-bundle resolution succeeds in `vite.config.ts`
- Update AGENTS.md project tree

Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

AGENTS.md

@@ -16,9 +16,7 @@ inspector/
 │   │   │                               #   web-server-config.ts (env parsing + initial-config payload + banner),
 │   │   │                               #   sandbox-controller.ts (MCP Apps sandbox HTTP server),
 │   │   │                               #   inject-auth-token.ts (embeds the API token into served index.html),
-│   │   │                               #   vite-base-config.ts (shared optimizeDeps exclusions),
-│   │   │                               #   quiet-config-warnings.mjs (--import hook for `npm run dev`: drops benign
-│   │   │                               #     node-only UNRESOLVED_IMPORT warnings Rolldown prints at config load)
+│   │   │                               #   vite-base-config.ts (shared optimizeDeps exclusions)
 │   │   └── static/                     # sandbox_proxy.html (served by sandbox-controller for MCP Apps tab)
 │   ├── cli/                            # CLI client (tsup bundle, @inspector/core alias)
 │   ├── tui/                            # TUI client (Ink + React, tsup bundle)