Add /install/tasks to middleware public paths

[psdjungpulzze]

Problem

src/middleware.ts redirects all unauthenticated requests to the login page. /install/tasks is not in the isPublicPath list, so curl -fsSL https://build.interactor.com/install/tasks | sh still returns an HTML login page even though the route was added in #276.

Fix

Add pathname.startsWith("/install/") to the isPublicPath block in src/middleware.ts.

Acceptance Criteria

• curl -fsSL https://build.interactor.com/install/tasks | sh returns #!/bin/sh as the first line
• All existing auth-protected routes are unaffected

Task

Task #34 — add-install-tasks-to-middleware-public-paths