feat: add integrated terminal with tab system and theme support

- Add terminal view with draggable split panels and multi-tab support
- Implement terminal WebSocket server with password protection
- Add per-terminal font size that persists when moving between tabs
- Support all 12 app themes with matching terminal colors
- Add keyboard shortcut (Ctrl+`) to toggle terminal view
- Include scrollback buffer for session history on reconnect

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

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

apps/server/.env.example

@@ -43,3 +43,14 @@ OPENAI_API_KEY=
 
 # Google API key (for future Gemini support)
 GOOGLE_API_KEY=
+
+# ============================================
+# OPTIONAL - Terminal Access
+# ============================================
+
+# Enable/disable terminal access (default: true)
+TERMINAL_ENABLED=true
+
+# Password to protect terminal access (leave empty for no password)
+# If set, users must enter this password before accessing terminal
+TERMINAL_PASSWORD=test