docs: Update installation instructions to use uv package manager (#799)

Author: Luodian

CLAUDE.md

@@ -2,10 +2,22 @@
 
 This document contains critical information about working with this codebase. Follow these guidelines precisely.
 
+## Environment Setup
+
+To ensure everyone uses the same environment, follow these steps:
+
+1. **Initial Setup**: Run `uv sync` to create/update your environment from the lockfile
+2. **After Pulling Changes**: If `uv.lock` has changed, run `uv sync` again
+3. **Adding Dependencies**: Use `uv add <package>` which updates both pyproject.toml and uv.lock
+4. **Removing Dependencies**: Use `uv remove <package>`
+
+The `uv.lock` file ensures all developers and CI/CD systems use exactly the same package versions.
+
 ## Core Development Rules
 
 1. Package Management
    - ONLY use uv, NEVER pip
+   - Environment setup: `uv sync` (creates consistent environment from uv.lock)
    - Installation: `uv add package`
    - Running tools: `uv run tool`
    - Upgrading: `uv add --dev package --upgrade-package package`

README.md

@@ -60,22 +60,38 @@ We humbly obsorbed the exquisite and efficient design of [lm-evaluation-harness]
 
 ## Installation
 
-For direct usage, you can install the package from Git by running the following command:
+### Using uv (Recommended for consistent environments)
+
+We use `uv` for package management to ensure all developers use exactly the same package versions. First, install uv:
 ```bash
 curl -LsSf https://astral.sh/uv/install.sh | sh
-uv venv eval
-uv venv --python 3.12
-source eval/bin/activate
-uv pip install git+https://github.com/EvolvingLMMs-Lab/lmms-eval.git
 ```
 
-For development, you can install the package by cloning the repository and running the following command:
+For development with consistent environment:
 ```bash
 git clone https://github.com/EvolvingLMMs-Lab/lmms-eval
 cd lmms-eval
-uv venv dev
-source dev/bin/activate
-uv pip install -e .
+uv sync  # This creates/updates your environment from uv.lock
+```
+
+To run commands:
+```bash
+uv run python -m lmms_eval --help  # Run any command with uv run
+```
+
+To add new dependencies:
+```bash
+uv add <package>  # Updates both pyproject.toml and uv.lock
+```
+
+### Alternative Installation
+
+For direct usage from Git:
+```bash
+uv venv eval
+uv venv --python 3.12
+source eval/bin/activate
+uv pip install git+https://github.com/EvolvingLMMs-Lab/lmms-eval.git
 ```
 
 <details>

pyproject.toml

@@ -19,7 +19,7 @@ classifiers = [
     "License :: OSI Approved :: MIT License",
     "Operating System :: OS Independent",
 ]
-requires-python = ">=3.8"
+requires-python = ">=3.9"
 dependencies = [
     "accelerate>=0.29.1",
     "black>=24.1.0",