Changes:
- Build all packages (core, auth, blocks, admin) from source
- Copy packages with -L dereferencing symlinks so deps resolve properly
- Use emdash@0.9.0 from npm (source packages include their own deps)
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
The blog template's db.ts imported 'mysql' from 'emdash/db' but the
patched source only exports sqlite, libsql, and postgres adapters.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>