perf: Vite 构建启用 code splitting，Bun RSS 从 966MB 降至 35MB

Bun/JSC 全量解析单文件大 JS 的 bytecode 和 JIT，17MB 产物导致
RSS 暴涨至 ~1GB（Node/V8 懒解析仅需 ~220MB）。启用代码分割后
Bun 按需加载 chunk，--version RSS 35MB，完整加载 ~500MB。

改动：
- vite.config.ts: 移除 codeSplitting:false，添加 chunkFileNames
- post-build.ts: 遍历 dist/ + dist/chunks/ 所有文件做 Bun patch
- 新建 distRoot.ts 共享工具函数，统一路径定位逻辑
- ripgrep.ts/computerUse/setup.ts/claudeInChrome/setup.ts/updateCCB.ts:
  用 distRoot 替换内联 import.meta.url 路径推算

src/utils/claudeInChrome/setup.ts

@@ -2,7 +2,6 @@ import { BROWSER_TOOLS } from '@ant/claude-for-chrome-mcp'
 import { chmod, mkdir, readFile, writeFile } from 'fs/promises'
 import { homedir } from 'os'
 import { join } from 'path'
-import { fileURLToPath } from 'url'
 import {
   getIsInteractive,
   getIsNonInteractiveSession,
@@ -11,6 +10,7 @@ import {
 import { getFeatureValue_CACHED_MAY_BE_STALE } from '../../services/analytics/growthbook.js'
 import type { ScopedMcpServerConfig } from '../../services/mcp/types.js'
 import { isInBundledMode } from '../bundledMode.js'
+import { distRoot } from '../distRoot.js'
 import { getGlobalConfig, saveGlobalConfig } from '../config.js'
 import { logForDebugging } from '../debug.js'
 import {
@@ -135,9 +135,7 @@ export function setupClaudeInChrome(): {
       systemPrompt: getChromeSystemPrompt(),
     }
   } else {
-    const __filename = fileURLToPath(import.meta.url)
-    const __dirname = join(__filename, '..')
-    const cliPath = join(__dirname, 'cli.js')
+    const cliPath = join(distRoot, 'cli.js')
 
     void createWrapperScript(
       `"${process.execPath}" "${cliPath}" --chrome-native-host`,