fix: update Python version constraints in project files

[Ki-Seki]

Description

Summary:

According to @likeUMR, the current Python version requirement in pyproject.toml is >=3.10,<4.0 (too restrictive), which sometimes causes Poetry to fail version resolution when conducting poetry add MemoryOS.

The current solution follows Poetry's official recommendation: https://python-poetry.org/docs/pyproject#requires-python.

It separates the more lenient project section (as per Python PEP 621) from Poetry's stricter tool.poetry.dependencies (see: Poetry documentation). This approach satisfies both cases: managing poetry add MemoryOS (requiring looser Python constraints) and adding dependencies for MemoryOS (requiring more precise Python constraints).

Reviewer: @CaralHsi @likeUMR

Checklist:

• I have performed a self-review of my own code | 我已自行检查了自己的代码
• I have mentioned the person who will review this PR | 我已提及将审查此 PR 的人

[CaralHsi]

Looks Good