feat: add interactive terminal and dev server management

Add new features for interactive terminal sessions and dev server control:

Terminal Component:
- New Terminal.tsx component using xterm.js for full terminal emulation
- WebSocket-based PTY communication with bidirectional I/O
- Cross-platform support (Windows via winpty, Unix via built-in pty)
- Auto-reconnection with exponential backoff
- Fix duplicate WebSocket connection bug by checking CONNECTING state
- Add manual close flag to prevent auto-reconnect race conditions
- Add project tracking to avoid duplicate connects on initial activation

Dev Server Management:
- New DevServerControl.tsx for starting/stopping dev servers
- DevServerManager service for subprocess management
- WebSocket streaming of dev server output
- Project configuration service for reading package.json scripts

Backend Infrastructure:
- Terminal router with WebSocket endpoint for PTY I/O
- DevServer router for server lifecycle management
- Terminal session manager with callback-based output streaming
- Enhanced WebSocket schemas for terminal and dev server messages

UI Integration:
- New Terminal and Dev Server tabs in the main application
- Updated DebugLogViewer with improved UI and functionality
- Extended useWebSocket hook for terminal message handling

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

server/services/__init__.py

@@ -6,5 +6,31 @@ Business logic and process management services.
 """
 
 from .process_manager import AgentProcessManager
+from .project_config import (
+    clear_dev_command,
+    detect_project_type,
+    get_default_dev_command,
+    get_dev_command,
+    get_project_config,
+    set_dev_command,
+)
+from .terminal_manager import (
+    TerminalSession,
+    cleanup_all_terminals,
+    get_terminal_session,
+    remove_terminal_session,
+)
 
-__all__ = ["AgentProcessManager"]
+__all__ = [
+    "AgentProcessManager",
+    "TerminalSession",
+    "cleanup_all_terminals",
+    "clear_dev_command",
+    "detect_project_type",
+    "get_default_dev_command",
+    "get_dev_command",
+    "get_project_config",
+    "get_terminal_session",
+    "remove_terminal_session",
+    "set_dev_command",
+]