Fix SubmitBody.log_quota_hour serialization with Field(include=True)

Without Field(include=True), pydantic's .json() drops fields that lack
an include annotation when other fields in the model use Field(include=...).

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: Andrey Cheptsov

src/dstack/_internal/server/schemas/runner.py

@@ -103,7 +103,7 @@ class SubmitBody(CoreModel):
     cluster_info: Annotated[Optional[ClusterInfo], Field(include=True)]
     secrets: Annotated[Optional[Dict[str, str]], Field(include=True)]
     repo_credentials: Annotated[Optional[RemoteRepoCreds], Field(include=True)]
-    log_quota_hour: Optional[int] = None
+    log_quota_hour: Annotated[Optional[int], Field(include=True)] = None
     """Maximum bytes of log output per hour. None means unlimited."""
     # TODO: remove `run_spec` once instances deployed with 0.19.8 or earlier are no longer supported.
     run_spec: Annotated[