feat(user): 添加用户登录功能

- 实现用户名密码登录
- 添加登录表单验证
- 集成第三方登录接口

Closes #123

// Render formulas within a specific element
function renderMath(element) {
  if (window.MathJax) {
    MathJax.typesetPromise([element]).catch((err) => {
      console.error('MathJax rendering failed:', err);
    });
  }
}

// Render all formulas in the document
function renderAllMath() {
  if (window.MathJax) {
    MathJax.typesetPromise().catch((err) => {
      console.error('MathJax rendering failed:', err);
    });
  }
}

import { throttle } from 'lodash-es';

methods: {
  handleScroll: throttle(function() {
    const scrollTop = this.$refs.container.scrollTop;
    this.updateVisibleData(scrollTop);
  }, 16)
}

# Add Java 21
jenv add "$(/usr/libexec/java_home -v 21)"

# Add Java 8
jenv add "$(/usr/libexec/java_home -v 1.8)"

# Add a JDK from a non-standard directory
jenv add "/path/to/your/jdk/Contents/Home"

# Refresh shims
jenv rehash

const userName = 'John'          // ✅ Correct
const MAX_RETRY = 3              // ✅ Correct
const isLogin = true             // ✅ Correct
const getUserList = () => {}     // ✅ Correct
const UserComponent = {}         // ✅ Correct

# 1. Global: Sets the default Java version for all terminals/projects
jenv global 21

# 2. Local: Sets the Java version for the current directory and its subdirectories
# This creates a .java-version file in the folder
cd /path/to/project
jenv local 1.8

# 3. Shell: Sets the Java version for the current terminal session only
jenv shell 1.8

<script setup lang="ts">
import { ref, computed } from 'vue'

const props = defineProps<{ title: string, count?: number }>()
const emit = defineEmits<{ (e: 'update', value: string): void, (e: 'close'): void }>()

const message = ref('Hello')
const doubleCount = computed(() => (props.count ?? 0) * 2)

const handleClick = () => {
  emit('update', message.value)
}
</script>

<template>
  <div class="my-component">
    <h1>{{ title }}</h1>
    <p>{{ doubleCount }}</p>
    <button @click="handleClick">Update</button>
  </div>
</template>

<style lang="scss" scoped>
.my-component { padding: 16px; }
</style>

# 1. Prefer Conda for installation
conda install requests
conda install requests=2.32

# 2. Use pip only if the package is unavailable in Conda
# Use 'python -m pip' to ensure the package goes to the active environment
python -m pip install fastapi uvicorn

# List installed packages in current environment
conda list
# List packages in a specific environment without activating it
conda list -n <env_name>

# Update packages
conda update <package_name>
python -m pip install --upgrade <package_name>

# Uninstall packages
conda remove <package_name>
python -m pip uninstall <package_name>

# Create a new environment
conda create -n project_name python=3.12 pip

# Activate the environment
conda activate project_name

# Install dependencies
python -m pip install -r requirements.txt

# Export environment configuration
conda env export --from-history > environment.yml

# Deactivate environment
conda deactivate

# Check current active version and its source
jenv version

# Set Java 21 as the global default version
jenv global 21

# Fix a specific project to use Java 8 (creates a .java-version file in the current directory)
jenv local 1.8

# Temporarily switch the current terminal session to Java 8
jenv shell 1.8

# Unset the temporary shell version and return to global/local setting
jenv shell --unset