chore(lint): modernize typing (PEP 604/585) and enable UP032 (#1537)

### What does this PR do?

Type of change: chore / refactor (no behavior change)

Two small lint-cleanup commits:

**1. `chore(typing): modernize Union/Optional/List to PEP 604 / 585
syntax`** (8 files)

- Replace `X = Union[A, B] # noqa: UP007` with `X: TypeAlias = A | B`
for the six module-level type aliases (`ModelLike`, `Criterion`,
`NodeTarget`, `CalibrationDataType`, `Hparam.Importance` /
`ActiveSlice`). The `TypeAlias` annotation is required so mypy continues
to treat them as aliases under PEP 604.
- Modernize forward-ref unions in `modelopt/onnx/quantization/autotune/`
to full-string forward refs (e.g. `"RegionPattern | None"`).
- Update docstring type tags in
`examples/puzzletron/evaluation/hf_deployable_anymodel.py`.

**2. `chore(lint): remove UP032 ignore and convert .format() to
f-strings`** (10 files)

- Drop `UP032` from `extend-ignore` in `pyproject.toml`.
- Auto-convert 19 `"...".format(...)` calls to f-strings across export
plugins, examples, tests, and tools. One conversion in
`modelopt/torch/utils/plugins/megatron_generate.py` was wrapped manually
to stay under the 100-char limit.

**Intentionally left as-is:**

- `tools/launcher/slurm_config.py` keeps its `# ruff: noqa: UP045` —
nemo_run's CLI parser can't introspect PEP 604 optional annotations.
- `modelopt/torch/puzzletron/*` is **not** touched. The subtree disables
ruff's `UP` family entirely (per-file-ignore `"UP"`) while migration is
in progress, and converting `Optional[X]` to `X | None` there would
silently break runtime introspection in
`block_config._get_dataclass_type` that uses `get_origin(tp) is
typing.Union` (PEP 604 unions return `types.UnionType` from
`get_origin`, not `typing.Union`). Best revisited when puzzletron's lint
carve-out is narrowed.
- `UP038` (`isinstance(x, (int, float))` → `isinstance(x, int | float)`)
— ruff has officially deprecated this rule; PEP 604 in isinstance is
slightly slower and misleads readers about PEP 695 / `Optional`. Ignore
kept.

### Usage

No user-facing API changes.

### Testing

- Pre-commit hooks (ruff check, ruff format, mypy, bandit, license) pass
on both commits.
- Ruff status against `main`: 37 unrelated pre-existing findings
(W291/W293/E501/RUF005/PLR1704); zero new findings introduced by this
PR.

### Before your PR is "*Ready for review*"

- Is this change backward compatible?: ✅ — Runtime behavior of the six
type aliases changes from a `typing.Union` instance to
`types.UnionType`. Downstream code introspecting via `get_origin(...) is
typing.Union` on these aliases would break, but no in-repo caller does
this on them. (The introspection in
`modelopt/torch/puzzletron/block_config.py` operates on user-supplied
dataclass field types, none of which are these aliases.)
- If you copied code from any other sources or added a new PIP
dependency, did you follow guidance in `CONTRIBUTING.md`: N/A
- Did you write any new necessary tests?: N/A (no behavior change)
- Did you update
[Changelog](https://github.com/NVIDIA/Model-Optimizer/blob/main/CHANGELOG.rst)?:
❌ — internal style refactor; happy to add a Misc note if reviewers want
one.
- Did you get Claude approval on this PR?: ❌ — not yet.


<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit

* **Style**
* Modernized type annotations across the codebase to use Python 3.10+
union syntax and TypeAlias where appropriate.
* Standardized string formatting to f-strings, improving clarity of
logs, errors, and validation messages.

* **Chores**
  * Updated linting configuration to reflect modern typing/style rules.

<!-- review_stack_entry_start -->

[![Review Change
Stack](https://storage.googleapis.com/coderabbit_public_assets/review-stack-in-coderabbit-ui.svg)](https://app.coderabbit.ai/change-stack/NVIDIA/Model-Optimizer/pull/1537?utm_source=github_walkthrough&utm_medium=github&utm_campaign=change_stack)

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<!-- end of auto-generated comment: release notes by coderabbit.ai -->

---------

Signed-off-by: Shengliang Xu <shengliangx@nvidia.com>

examples/speculative_decoding/collect_hidden_states/send_conversations_for_hiddens.py

@@ -130,7 +130,7 @@ async def main(args: argparse.Namespace) -> None:
             total=num_total_conversations,
         )
     ):
-        conversation_id = entry.get("conversation_id", "{:08d}".format(idx))
+        conversation_id = entry.get("conversation_id", f"{idx:08d}")
         conversations = entry["conversations"]
         if not conversations or not isinstance(conversations, list):
             num_invalid += 1

examples/speculative_decoding/scripts/send_conversation_vllm.py

@@ -117,8 +117,8 @@ def parse_args() -> argparse.Namespace:
 async def main(args: argparse.Namespace) -> None:
     for shard_id in range(args.shard_id_begin, args.num_shards, args.shard_id_step):
         if args.num_shards > 1:
-            input_file_path = args.input_file / "train-{:05}-{:05}.jsonl".format(
-                shard_id + 1, args.num_shards
+            input_file_path = (
+                args.input_file / f"train-{shard_id + 1:05}-{args.num_shards:05}.jsonl"
             )
         else:
             input_file_path = args.input_file
@@ -177,7 +177,7 @@ async def main(args: argparse.Namespace) -> None:
             if conversation_id is None:
                 conversation_id = entry.get("uuid", None)
             if conversation_id is None:
-                conversation_id = "{:08d}".format(idx)
+                conversation_id = f"{idx:08d}"
             conversations = entry["conversations"]
             if not conversations or not isinstance(conversations, list):
                 num_invalid += 1