feat(orchestrator): redesign orchestrator page as template editor with terminal execution

Phase 1: Orchestrator Simplification
- Remove ExecutionMonitor from OrchestratorPage
- Replace "Run Workflow" button with "Send to Terminal" button
- Update i18n texts for template editor context

Phase 2: Session Lock Mechanism
- Add 'locked' status to TerminalStatus type
- Extend TerminalMeta with isLocked, lockReason, lockedByExecutionId, lockedAt
- Implement lockSession/unlockSession in sessionManagerStore
- Create SessionLockConfirmDialog component for input interception

Phase 3: Execution Monitor Panel
- Create executionMonitorStore for execution state management
- Create ExecutionMonitorPanel component with step progress display
- Add execution panel to DashboardToolbar and TerminalDashboardPage
- Support WebSocket message handling for execution updates

Phase 4: Execution Bridge
- Add POST /api/orchestrator/flows/:id/execute-in-session endpoint
- Create useExecuteFlowInSession hook for frontend API calls
- Broadcast EXECUTION_STARTED and CLI_SESSION_LOCKED WebSocket messages
- Lock session when execution starts, unlock on completion

ccw/frontend/src/pages/TerminalDashboardPage.tsx

@@ -22,6 +22,7 @@ import { AgentList } from '@/components/terminal-dashboard/AgentList';
 import { IssuePanel } from '@/components/terminal-dashboard/IssuePanel';
 import { QueuePanel } from '@/components/terminal-dashboard/QueuePanel';
 import { InspectorContent } from '@/components/terminal-dashboard/BottomInspector';
+import { ExecutionMonitorPanel } from '@/components/terminal-dashboard/ExecutionMonitorPanel';
 import { FileSidebarPanel } from '@/components/terminal-dashboard/FileSidebarPanel';
 import { useWorkflowStore, selectProjectPath } from '@/stores/workflowStore';
 import { useAppStore, selectIsImmersiveMode } from '@/stores/appStore';
@@ -128,6 +129,16 @@ export function TerminalDashboardPage() {
         >
           <InspectorContent />
         </FloatingPanel>
+
+        <FloatingPanel
+          isOpen={activePanel === 'execution'}
+          onClose={closePanel}
+          title={formatMessage({ id: 'terminalDashboard.toolbar.executionMonitor', defaultMessage: 'Execution Monitor' })}
+          side="right"
+          width={380}
+        >
+          <ExecutionMonitorPanel />
+        </FloatingPanel>
       </AssociationHighlightProvider>
     </div>
   );