Fix deployment to work within /opt/immersive directory

Move contents instead of directory itself to avoid permission issues
with gitea-runner user who has write access inside but not to /opt.

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

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

.github/workflows/build.yml

@@ -31,22 +31,20 @@ jobs:
 
       - name: Deploy to /opt/immersive
         run: |
-          # Remove old deployment (keep data directory if it exists)
-          rm -rf /opt/immersive.old
-          [ -d /opt/immersive ] && mv /opt/immersive /opt/immersive.old
+          # Backup data directory if it exists
+          [ -d /opt/immersive/data ] && mv /opt/immersive/data /tmp/immersive-data
+
+          # Remove old files (except data which we moved)
+          rm -rf /opt/immersive/*
 
           # Copy built files to target
-          mkdir -p /opt/immersive
           cp -r . /opt/immersive/
 
           # Remove unnecessary directories
           rm -rf /opt/immersive/.git /opt/immersive/.github
 
-          # Restore data directory from old deployment if it existed
-          [ -d /opt/immersive.old/data ] && mv /opt/immersive.old/data /opt/immersive/
-
-          # Clean up old deployment
-          rm -rf /opt/immersive.old
+          # Restore data directory
+          [ -d /tmp/immersive-data ] && mv /tmp/immersive-data /opt/immersive/data
 
           # Set permissions on start.sh
           chmod +x /opt/immersive/start.sh

.github/workflows/main.yml

@@ -2,9 +2,9 @@ name: Node.js CI
 
 on:
   push:
-    branches: [ "main" ]
+    branches: [ "deepdiagram" ]
   pull_request:
-    branches: [ "main" ]
+    branches: [ "deepdiagram" ]
 
 jobs:
   build: