refactor: 简化 ccw 安装流程，移除远程下载功能

- 删除 version-fetcher.js，移除 GitHub API 依赖
- install.js: 移除远程版本选择，只保留本地安装
- upgrade.js: 重写为本地升级，比对包版本与已安装版本
- cli.js: 移除 -v/-t/-b 等版本相关选项
- 添加 CLAUDE.md 复制到 .claude 目录的逻辑

版本管理统一到 npm：npm install -g ccw@版本号

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

ccw/src/utils/version-fetcher.js

@@ -1,252 +0,0 @@
-import https from 'https';
-import { existsSync, mkdirSync, createWriteStream, rmSync } from 'fs';
-import { join } from 'path';
-import { tmpdir } from 'os';
-import { createUnzip } from 'zlib';
-import { pipeline } from 'stream/promises';
-
-// GitHub repository URL
-export const REPO_URL = 'https://github.com/catlog22/Claude-Code-Workflow';
-const API_BASE = 'https://api.github.com/repos/catlog22/Claude-Code-Workflow';
-
-/**
- * Make HTTPS request with JSON response
- * @param {string} url - URL to fetch
- * @param {number} timeout - Timeout in ms (default: 10000)
- * @returns {Promise<Object>}
- */
-function fetchJson(url, timeout = 10000) {
-  return new Promise((resolve, reject) => {
-    const req = https.get(url, {
-      headers: {
-        'User-Agent': 'ccw-installer',
-        'Accept': 'application/vnd.github.v3+json'
-      },
-      timeout
-    }, (res) => {
-      // Handle redirects
-      if (res.statusCode >= 300 && res.statusCode < 400 && res.headers.location) {
-        return fetchJson(res.headers.location, timeout).then(resolve).catch(reject);
-      }
-
-      if (res.statusCode !== 200) {
-        reject(new Error(`HTTP ${res.statusCode}: ${res.statusMessage}`));
-        return;
-      }
-
-      let data = '';
-      res.on('data', chunk => { data += chunk; });
-      res.on('end', () => {
-        try {
-          resolve(JSON.parse(data));
-        } catch (err) {
-          reject(new Error('Invalid JSON response'));
-        }
-      });
-    });
-
-    req.on('error', reject);
-    req.on('timeout', () => {
-      req.destroy();
-      reject(new Error('Request timeout'));
-    });
-  });
-}
-
-/**
- * Fetch latest stable release info
- * @returns {Promise<{tag: string, date: string, url: string}>}
- */
-export async function fetchLatestRelease() {
-  const data = await fetchJson(`${API_BASE}/releases/latest`);
-
-  return {
-    tag: data.tag_name,
-    version: data.tag_name.replace(/^v/, ''),
-    date: data.published_at ? new Date(data.published_at).toLocaleDateString() : '',
-    url: data.zipball_url,
-    htmlUrl: data.html_url
-  };
-}
-
-/**
- * Fetch recent releases list
- * @param {number} limit - Number of releases to fetch
- * @returns {Promise<Array<{tag: string, date: string}>>}
- */
-export async function fetchRecentReleases(limit = 5) {
-  const data = await fetchJson(`${API_BASE}/releases?per_page=${limit}`);
-
-  return data.map(release => ({
-    tag: release.tag_name,
-    version: release.tag_name.replace(/^v/, ''),
-    date: release.published_at ? new Date(release.published_at).toLocaleDateString() : '',
-    url: release.zipball_url
-  }));
-}
-
-/**
- * Fetch latest commit from a branch
- * @param {string} branch - Branch name (default: main)
- * @returns {Promise<{sha: string, shortSha: string, date: string, message: string}>}
- */
-export async function fetchLatestCommit(branch = 'main') {
-  const data = await fetchJson(`${API_BASE}/commits/${branch}`);
-
-  return {
-    sha: data.sha,
-    shortSha: data.sha.substring(0, 7),
-    date: data.commit.committer.date ? new Date(data.commit.committer.date).toLocaleDateString() : '',
-    message: data.commit.message.split('\n')[0]
-  };
-}
-
-/**
- * Download file from URL
- * @param {string} url - URL to download
- * @param {string} destPath - Destination file path
- * @returns {Promise<void>}
- */
-function downloadFile(url, destPath) {
-  return new Promise((resolve, reject) => {
-    const file = createWriteStream(destPath);
-
-    https.get(url, {
-      headers: {
-        'User-Agent': 'ccw-installer',
-        'Accept': 'application/octet-stream'
-      }
-    }, (res) => {
-      // Handle redirects
-      if (res.statusCode >= 300 && res.statusCode < 400 && res.headers.location) {
-        file.close();
-        return downloadFile(res.headers.location, destPath).then(resolve).catch(reject);
-      }
-
-      if (res.statusCode !== 200) {
-        file.close();
-        reject(new Error(`Download failed: HTTP ${res.statusCode}`));
-        return;
-      }
-
-      res.pipe(file);
-      file.on('finish', () => {
-        file.close();
-        resolve();
-      });
-    }).on('error', (err) => {
-      file.close();
-      reject(err);
-    });
-  });
-}
-
-/**
- * Extract zip file using native unzip command or built-in
- * @param {string} zipPath - Path to zip file
- * @param {string} destDir - Destination directory
- * @returns {Promise<string>} - Extracted directory path
- */
-async function extractZip(zipPath, destDir) {
-  const { execSync } = await import('child_process');
-
-  // Try using native unzip commands
-  try {
-    // Try PowerShell Expand-Archive (Windows)
-    execSync(`powershell -Command "Expand-Archive -Path '${zipPath}' -DestinationPath '${destDir}' -Force"`, {
-      stdio: 'pipe'
-    });
-  } catch {
-    try {
-      // Try unzip command (Unix/Git Bash)
-      execSync(`unzip -o "${zipPath}" -d "${destDir}"`, { stdio: 'pipe' });
-    } catch {
-      throw new Error('No unzip utility available. Please install unzip or use PowerShell.');
-    }
-  }
-
-  // Find extracted directory
-  const { readdirSync } = await import('fs');
-  const entries = readdirSync(destDir);
-  const repoDir = entries.find(e => e.startsWith('Claude-Code-Workflow-') || e.startsWith('catlog22-Claude-Code-Workflow-'));
-
-  if (!repoDir) {
-    throw new Error('Could not find extracted repository directory');
-  }
-
-  return join(destDir, repoDir);
-}
-
-/**
- * Download and extract repository
- * @param {Object} options
- * @param {'stable'|'latest'|'branch'} options.type - Version type
- * @param {string} options.tag - Specific tag (for stable)
- * @param {string} options.branch - Branch name (for branch type)
- * @returns {Promise<{repoDir: string, version: string, branch: string, commit: string}>}
- */
-export async function downloadAndExtract(options = {}) {
-  const { type = 'stable', tag = '', branch = 'main' } = options;
-
-  // Create temp directory
-  const tempDir = join(tmpdir(), `ccw-install-${Date.now()}`);
-  if (!existsSync(tempDir)) {
-    mkdirSync(tempDir, { recursive: true });
-  }
-
-  let zipUrl;
-  let versionInfo = { version: '', branch: '', commit: '' };
-
-  // Determine download URL based on version type
-  if (type === 'stable') {
-    if (tag) {
-      zipUrl = `${REPO_URL}/archive/refs/tags/${tag}.zip`;
-      versionInfo.version = tag.replace(/^v/, '');
-      versionInfo.branch = tag;
-    } else {
-      const release = await fetchLatestRelease();
-      zipUrl = `${REPO_URL}/archive/refs/tags/${release.tag}.zip`;
-      versionInfo.version = release.version;
-      versionInfo.branch = release.tag;
-    }
-  } else if (type === 'latest') {
-    zipUrl = `${REPO_URL}/archive/refs/heads/main.zip`;
-    const commit = await fetchLatestCommit('main');
-    versionInfo.version = `dev-${commit.shortSha}`;
-    versionInfo.branch = 'main';
-    versionInfo.commit = commit.shortSha;
-  } else {
-    zipUrl = `${REPO_URL}/archive/refs/heads/${branch}.zip`;
-    const commit = await fetchLatestCommit(branch);
-    versionInfo.version = `dev-${commit.shortSha}`;
-    versionInfo.branch = branch;
-    versionInfo.commit = commit.shortSha;
-  }
-
-  // Download zip file
-  const zipPath = join(tempDir, 'repo.zip');
-  await downloadFile(zipUrl, zipPath);
-
-  // Extract zip
-  const repoDir = await extractZip(zipPath, tempDir);
-
-  return {
-    repoDir,
-    tempDir,
-    ...versionInfo
-  };
-}
-
-/**
- * Cleanup temporary directory
- * @param {string} tempDir - Temp directory to remove
- */
-export function cleanupTemp(tempDir) {
-  if (existsSync(tempDir)) {
-    try {
-      rmSync(tempDir, { recursive: true, force: true });
-    } catch {
-      // Ignore cleanup errors
-    }
-  }
-}