chore: bump version to 2.3.8 and pin Go toolchain to 1.25.0

Bump the crate version for a new release and make the go.mod
directive an explicit patch version so the toolchain requirement
is unambiguous.

Signed-off-by: Gaius <gaius.qi@gmail.com>

chore(deps): downgrade grpc to v1.80.0 and relax Go directive to 1.25 (…

…#685)

* chore(deps): downgrade grpc to v1.80.0 and relax Go directive to 1.25

Roll back google.golang.org/grpc from v1.83.1 to v1.80.0 along with its
transitive dependencies (golang.org/x/net, x/sys, x/text, genproto/rpc,
and the OpenTelemetry modules) to the versions matching that release.

Also loosen the go directive from 1.25.5 to 1.25 so consumers are not
forced onto a specific patch toolchain version.

Signed-off-by: Gaius <gaius.qi@gmail.com>

* chore: bump version to 2.3.7

Increment the package version from 2.3.6 to 2.3.7 in preparation
for the next release.

Signed-off-by: Gaius <gaius.qi@gmail.com>

---------

Signed-off-by: Gaius <gaius.qi@gmail.com>

feat(scheduler): add StatImage, PreheatFile, StatFile RPCs and enable…

…_task_id_based_blob_digest field (#682)

Add new `StatImage`, `PreheatFile`, and `StatFile` RPCs with supporting
message types to the scheduler v2 proto. Also add the
`enable_task_id_based_blob_digest` boolean field to `PreheatImageRequest`.
Regenerate protobuf bindings for Go, Python, and Rust, and bump version
to 2.3.6.

Signed-off-by: Gaius <gaius.qi@gmail.com>

feat(common): replace `need_scheduling` bool with `SchedulingPolicy` …

…enum in Download (#681)

Introduce a `SchedulingPolicy` enum and replace the boolean `need_scheduling`
field in the `Download` message with a `scheduling_policy` field across proto
definitions, generated Go/Python/Rust bindings, and bump the version to 2.3.5.

Signed-off-by: Gaius <gaius.qi@gmail.com>

feat(common/v2): add need_scheduling field to Download message (#680)

Add a boolean `need_scheduling` field to the `Download` message across proto definition, generated Go/Python/Rust bindings, and bump version to 2.3.4.

Signed-off-by: Gaius <gaius.qi@gmail.com>

feat(scheduler): add `enable_task_id_based_blob_digest` field to `Sta…

…tImageRequest` (#679)

Add the `enable_task_id_based_blob_digest` boolean field to `StatImageRequest` in the scheduler proto, regenerate all language bindings (Go, Python, Rust), and bump the version to 2.3.3.

Signed-off-by: Gaius <gaius.qi@gmail.com>

feat(scheduler): add `scope` field to `StatImageRequest` (#678)

Add a `scope` field to `StatImageRequest` to support filtering stat image peers. Update generated protobuf code across Go, Python, and Rust, and bump version to 2.3.2.

Signed-off-by: Gaius <gaius.qi@gmail.com>

feat: add OpenCSG download support (#675)

Merge branch 'feature/python'

feat(common): rename `hit_local_cache` to `metadata_only` in Download…

… proto

- Rename `HitLocalCache` field to `MetadataOnly` in `Download` struct
- Update getter from `GetHitLocalCache()` to `GetMetadataOnly()`
- Update proto field name from `hit_local_cache` to `metadata_only`
- Regenerate protobuf binary descriptor to reflect the field rename

Signed-off-by: Gaius <gaius.qi@gmail.com>