Rename root, api and sdk module paths (imports, go.mod, go_package,
ldflags, build scripts, buf configs) and regenerate protobuf/gateway
code with the project's pinned toolchain. Wire identifiers unchanged.
api gets a local replace for sdk; root/api/sdk require v0.1.0.
Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>
This removes the Cartesian product in the DB for GrantsForUser in favor
of returning the actual grant scope information and dealing with it in
application code.
(cherry picked from commit 913cd536823d73994acc4f4d833208c1cc05f91b)