Document concrete system requirements for running AgentEvolver #7

Problem

• The public README (README.md:88-127) only mentions “conda” and a “cuda toolkit” before installation, so new users do not know minimum OS, GPU compute capability / VRAM, CPU/RAM, Python/Conda versions, or disk/network expectations before cloning the repo.
• The detailed QuickStart (docs/tutorial/quick_start.md) likewise describes the command flow without enumerating the hardware/software prerequisites, making it hard to size the environment (especially for AppWorld + ReMe deployments).
• Without a single “System Requirements” section, contributors must infer requirements from scattered hints or trial and error, slowing onboarding and increasing support load.

Proposal

1. Add a “System Requirements” section near the top of README.md (and mirror/link it from docs/tutorial/quick_start.md) listing:
   • Supported OSes (tested Ubuntu version, macOS/Windows status if applicable).
   • Required CUDA toolkit + driver versions, minimum GPU memory, and guidance for CPU-only limitations.
   • Recommended CPU cores, RAM, and disk space for AppWorld/ReMe deployments.
   • Required Python/Conda versions and other global dependencies (Docker, tmux, open ports, etc.).
2. If requirements differ per workflow (basic vs. overall/ReMe), include a table summarizing each scenario.
3. Cross-link this section from installation scripts / docs so users see it before running install.sh.

Acceptance Criteria

• README prominently documents hardware/software prerequisites with concrete versions and resource estimates.
• Docs (e.g., QuickStart) reference the same requirements to keep guidance consistent.
• New users can determine whether their machine or GPU cluster meets the requirements without executing any scripts.