refactor: Separate git watcher from terminal service

- Create dedicated git-watcher.ts with its own WebSocket server (port 4105)
- Remove git watcher code from terminal.ts (no more PTY dependency)
- Add /ws/git endpoint for Traefik routing
- GitPage now connects to dedicated git WebSocket instead of terminal

server/services/terminal.ts

@@ -1,6 +1,4 @@
 import { spawn, type IPty } from '@skitee3000/bun-pty'
-import { watch, type FSWatcher } from 'fs'
-import { join } from 'path'
 import { PORT_TERMINAL, WORKING_DIR, SHELL, SHELL_ARGS, DEFAULT_SESSION_ID, MAX_BUFFER_LINES } from '../config'
 
 interface TerminalSession {
@@ -266,93 +264,3 @@ export function broadcastClaudeStatus(status: ClaudeStatus, tool?: string) {
 
   console.log(`[Terminal] Claude status broadcast: ${status}${tool ? ` (${tool})` : ''} → ${clientCount} clients`)
 }
-
-// Git watcher
-let gitWatcher: FSWatcher | null = null
-let gitDebounceTimer: Timer | null = null
-const GIT_DEBOUNCE_MS = 300
-
-function broadcastGitChange() {
-  const message = JSON.stringify({
-    type: 'git-change',
-    timestamp: Date.now()
-  })
-
-  let clientCount = 0
-  for (const [, session] of sessions) {
-    for (const ws of session.clients) {
-      try {
-        ws.send(message)
-        clientCount++
-      } catch {
-        // Client disconnected
-      }
-    }
-  }
-
-  if (clientCount > 0) {
-    console.log(`[Git] Change detected → ${clientCount} clients notified`)
-  }
-}
-
-// Files to ignore (noisy or irrelevant)
-const GIT_IGNORE_PATTERNS = [
-  'FETCH_HEAD',
-  'gc.log',
-  '.lock',
-  'COMMIT_EDITMSG',
-  'ORIG_HEAD',
-  'gitk.cache',
-  'sourcetreeconfig',
-  '.DS_Store',
-  'fsmonitor',
-  'packed-refs'
-]
-
-export function startGitWatcher() {
-  const gitDir = join(WORKING_DIR, '.git')
-
-  try {
-    // Watch .git directory recursively
-    gitWatcher = watch(gitDir, { recursive: true }, (eventType, filename) => {
-      if (!filename) return
-
-      // Ignore noisy files
-      const shouldIgnore = GIT_IGNORE_PATTERNS.some(pattern =>
-        filename.includes(pattern)
-      )
-      if (shouldIgnore) return
-
-      // Only react to meaningful changes
-      const isRelevant =
-        filename.includes('refs/') ||      // branch/tag changes
-        filename === 'HEAD' ||             // checkout
-        filename === 'index' ||            // staging area
-        filename.includes('objects/')      // new commits/blobs
-
-      if (!isRelevant) return
-
-      // Debounce to avoid flooding
-      if (gitDebounceTimer) {
-        clearTimeout(gitDebounceTimer)
-      }
-
-      gitDebounceTimer = setTimeout(() => {
-        console.log(`[Git] Change: ${filename}`)
-        broadcastGitChange()
-      }, GIT_DEBOUNCE_MS)
-    })
-
-    console.log(`[Git] Watching ${gitDir} for changes`)
-  } catch (e: any) {
-    console.error(`[Git] Failed to watch .git directory: ${e.message}`)
-  }
-}
-
-export function stopGitWatcher() {
-  if (gitWatcher) {
-    gitWatcher.close()
-    gitWatcher = null
-    console.log('[Git] Watcher stopped')
-  }
-}