Web UI not served on Windows build — `GET /` returns `not_found

[aqemi]

On the Windows release binary, msgvault serve starts and the HTTP API responds, but the web UI is not served. Requesting the root path returns a JSON routing error instead of the browser application:

{"error":"not_found","message":"No route matches GET /"}

The README states that the release binary serves the complete browser application and that Node, Bun, and a separate asset directory are not needed at runtime, so this looks like the embedded web assets are missing from the Windows build rather than a configuration problem on my side.

Environment

• msgvault version:
  commit: e90bcdc
  built: 2026-08-09T13:53:26Z
  go: go1.26.5
  os/arch: windows/amd64
• Install method: install.ps1

Steps to reproduce

1. Install via install.ps1 (or extract the Windows release zip)
2. msgvault init-db
3. Import or sync at least one account
4. msgvault serve
5. Open the API server URL printed by serve in a browser

Expected

The web UI loads at /.

Actual

GET / returns {"error":"not_found","message":"No route matches GET /"}. The server itself is running — API routes respond normally.

[Jakob-SD]

I have same issue on macOS with version installed through brew.

msgvault 0.19.3
commit: unknown
built: unknown
go: go1.26.5
os/arch: darwin/arm64

[aqemi]

@rodboev Is the current main not released yet? It looks like 0.19.3 should include the PR you mentioned, but apparently it still doesn't work.

[rodboev]

The reported Windows Web UI failure appears fixed on current main. PR #492 added the release workflow step that stages the built browser assets into internal/web before the Windows build, and the current handler serves index.html for /. Please close this issue if the released artifact now matches current main.

[aqemi]

Already running latest version (v0.19.3)
Issue still present.