#2100: Resolve python versions via uv instead of ide-urls

[Paras14]

This PR fixes #2100

Implemented changes:

• Added PythonRepository, a ToolRepository that resolves the list of installable Python versions from uv python list instead of from ide-urls. Python now uses this repository via an override of getToolRepository().
• PythonUrlUpdater and had no darwin/x64 (Intel Mac) branch. Installable versions (e.g. 3.14.6) were therefore reported as "not found" on Intel Mac. Sourcing versions from uv (the tool that actually installs Python) removes this class of gap, since
  uv only lists versions it can install for the current OS/architecture. Still entries for Intel Macs(darwin/x64), Windows on arm(win32/arm64), and Linux on arm(linux/arm64).
• Added Uv#parsePythonListJson(...) (defensive JSON parsing of uv python list) and the PythonUvListEntry record, with non-CPython entries (e.g. PyPy) are filtered out.
• Wired getPythonRepository() into IdeContext and AbstractIdeContext
• Fixed a bootstrap ordering issue, where version resolution runs before tool dependencies are installed, so fetchUvPythonList() uses the runTool variant that ensures uv is installed before running it.
• CVE-security and dependency metadata for Python continue to come from ide-urls, which only need the tool folder and
  are unaffected by the per-platform gap.
• Minor: added Javadoc to UvRepository.

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Testing instructions

Automated:

1. Run PythonRepositoryTest.java and PythonTest.java.

Manual:

2. On a machine with uv available, you can confirm that uv python list --all-versions --only-downloads --output-format json --no-config lists the expected CPython versions for your platform.
3. In a fresh IDEasy project where uv is not yet installed, run ide install python 3.14*. Expected: uv is installed first, then uv python list resolves 3.14.6, then Python 3.14.6 is installed successfully. Make sure you do it in a different new folder.
4. If possible, run step 3 on genuine Intel-Mac hardware, since that is the platform originally reported in Python not available for Mac x64 #2100.

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