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

frontend/src/config/endpoints.ts

@@ -27,6 +27,9 @@ export const endpoints = {
   // Terminal WebSocket
   terminal: buildWsUrl('/ws/terminal', 4103),
 
+  // Git WebSocket (realtime notifications, separate from terminal)
+  git: buildWsUrl('/ws/git', 4105),
+
   // Claude status WebSocket (same backend as terminal)
   claudeStatus: buildWsUrl('/ws/status', 4103),
 

frontend/src/pages/GitPage.vue

@@ -50,7 +50,7 @@ const isRealtime = ref(false)
 function connectGitWatcher() {
   if (gitSocket?.readyState === WebSocket.OPEN) return
 
-  gitSocket = new WebSocket(endpoints.terminal)
+  gitSocket = new WebSocket(endpoints.git)
 
   gitSocket.onopen = () => {
     isRealtime.value = true