Refresh azure-mgmt-networkcloud after migrate to Typespec

[azure-sdk]

Configurations: 'specification/networkcloud/NetworkCloud.Management/tspconfig.yaml', API Version: 2025-09-01, SDK Release Type: stable, and CommitSHA: 'a430f45f77965c41f092e4450f1bffd37a47409f' in SpecRepo: 'https://github.com/Azure/azure-rest-api-specs' Pipeline run: https://dev.azure.com/azure-sdk/internal/_build/results?buildId=6475886 Refer to https://eng.ms/docs/products/azure-developer-experience/develop/sdk-release/sdk-release-prerequisites to prepare for SDK release.

[Copilot]

Pull request overview

This PR refreshes the azure-mgmt-networkcloud management library after its migration to TypeSpec, promoting the package from the preview 3.0.0b1 to the stable 3.0.0 release (API version 2025-09-01). It regenerates the SDK from a newer commit/emitter (0.63.2), updates the public client docstrings and Self import handling, drops Python 3.9 support, and carries forward the large TypeSpec-driven API surface change (resource properties moved under a nested properties object).

Changes:

• Bumps the package to stable 3.0.0 (_version.py, pyproject.toml stability flags/classifiers, tsp-location.yaml/_metadata.json commit & emitter, plus a regenerated CHANGELOG.md).
• Drops Python 3.9 and adds Python 3.14 across README.md and pyproject.toml; updates README auth wording from "Azure Active Directory" to "Microsoft Entra".
• Regenerates client/operations/serialization helper code (conditional typing.Self import, headers=_headers on paginated next-link requests, new numeric duration formats and XML/header fast-path deserialization in _utils), and adds api.metadata.yml + CrossLanguageVersion metadata.

Reviewed changes

Copilot reviewed 16 out of 17 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
_version.py	Bumps VERSION to stable 3.0.0; matches CHANGELOG.
pyproject.toml	Sets is_stable=true, Production/Stable classifier, requires-python>=3.10, adds 3.14.
CHANGELOG.md	Adds 3.0.0 (2026-06-24) entry (features + breaking changes).
README.md	Python 3.10+, AAD→Microsoft Entra wording.
tsp-location.yaml / _metadata.json	Updates spec commit and emitter/httpClient versions.
_client.py / aio/_client.py	Conditional Self import (adds import sys), updated api_version docstring.
_configuration.py / aio/_configuration.py	Updated api_version docstring.
operations/_operations.py / aio/...	Pass headers=_headers to next-link pagination requests.
_utils/serialization.py / _utils/model_base.py	Generated helper updates (numeric durations, XML/header fast paths).
apiview-properties.json / api.metadata.yml	Adds CrossLanguageVersion and API metadata snapshot.

Per the MGMT SDK review rules, I focused on _client.py and the package metadata/docs and verified: version consistency (3.0.0 in both _version.py and CHANGELOG), stable stability flags, the client __init__ parameter order (credential, subscription_id, base_url), client-name consistency (NetworkCloudMgmtClient across code, README, and pyproject title), and that the new sys.version_info guards have a valid sys import. The remaining generated source under azure/mgmt/** was treated as out of scope. No blocking issues were found in the reviewable surface, but the change is a large major-version release with extensive breaking changes and non-trivial shared serialization/model-base helper modifications.