feat(queue): implement queue scheduler service and API routes

- Added QueueSchedulerService to manage task queue lifecycle, including state machine, dependency resolution, and session management.
- Implemented HTTP API endpoints for queue scheduling:
  - POST /api/queue/execute: Submit items to the scheduler.
  - GET /api/queue/scheduler/state: Retrieve full scheduler state.
  - POST /api/queue/scheduler/start: Start scheduling loop with items.
  - POST /api/queue/scheduler/pause: Pause scheduling.
  - POST /api/queue/scheduler/stop: Graceful stop of the scheduler.
  - POST /api/queue/scheduler/config: Update scheduler configuration.
- Introduced types for queue items, scheduler state, and WebSocket messages to ensure type safety and compatibility with the backend.
- Added static model lists for LiteLLM as a fallback for available models.

ccw/frontend/src/locales/en/history.json

@@ -3,7 +3,8 @@
   "description": "View and manage your CLI execution history",
   "tabs": {
     "executions": "Executions",
-    "observability": "Session Audit"
+    "observability": "Session Audit",
+    "nativeSessions": "Native Sessions"
   },
   "searchPlaceholder": "Search executions...",
   "filterAllTools": "All Tools",
@@ -33,5 +34,13 @@
     "message": "CLI execution history will appear here when you run CLI commands.",
     "filtered": "No Matching Results",
     "filteredMessage": "No executions match your current filter. Try adjusting your search or filter."
+  },
+  "nativeSessions": {
+    "count": "{count} native sessions",
+    "sessions": "sessions",
+    "empty": {
+      "title": "No Native Sessions",
+      "message": "Native CLI sessions from Gemini, Codex, Qwen, etc. will appear here."
+    }
   }
 }

ccw/frontend/src/locales/en/terminal-dashboard.json

@@ -48,6 +48,11 @@
   "issuePanel": {
     "title": "Issues",
     "sendToQueue": "Send to Queue",
+    "addToQueue": "Queue",
+    "addToQueueHint": "Add selected issues to the execution queue",
+    "addedToQueue": "Queued!",
+    "addToQueueFailed": "Failed to add to queue",
+    "queueModeHint": "Execution mode for queued items",
     "noIssues": "No issues found",
     "noIssuesDesc": "Issues will appear here when discovered",
     "error": "Failed to load issues"
@@ -59,13 +64,35 @@
     "error": "Failed to load queue",
     "order": "#{order}",
     "dependsOn": "Depends on: {deps}",
+    "blockedBy": "Blocked by: {deps}",
     "status": {
       "pending": "Pending",
+      "queued": "Queued",
       "ready": "Ready",
+      "blocked": "Blocked",
       "executing": "Executing",
       "completed": "Completed",
       "failed": "Failed",
-      "blocked": "Blocked"
+      "cancelled": "Cancelled",
+      "skipped": "Skipped"
+    },
+    "scheduler": {
+      "start": "Start",
+      "pause": "Pause",
+      "stop": "Stop",
+      "status": {
+        "idle": "Idle",
+        "running": "Running",
+        "paused": "Paused",
+        "stopping": "Stopping",
+        "completed": "Completed",
+        "failed": "Failed"
+      },
+      "progress": "{percent}%",
+      "concurrency": "Concurrency",
+      "concurrencyLabel": "Max",
+      "stopConfirmTitle": "Stop Queue?",
+      "stopConfirmMessage": "Executing tasks will finish, but no new tasks will be started. Pending items will remain in the queue."
     }
   },
   "toolbar": {
@@ -81,7 +108,13 @@
     "launchCli": "New Session",
     "launchCliHint": "Click to configure and create a new CLI session",
     "fullscreen": "Fullscreen",
-    "orchestrator": "Orchestrator"
+    "orchestrator": "Orchestrator",
+    "scheduler": "Scheduler",
+    "executionMonitor": "Execution Monitor"
+  },
+  "schedulerPanel": {
+    "sessionPool": "Session Pool",
+    "noSessions": "No active sessions"
   },
   "orchestratorPanel": {
     "noPlans": "No active orchestrations",