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/src/core/routes/cli-routes.ts

@@ -23,6 +23,7 @@ import {
   getEnrichedConversation,
   getHistoryWithNativeInfo
 } from '../../tools/cli-executor.js';
+import { listAllNativeSessions } from '../../tools/native-session-discovery.js';
 import { SmartContentFormatter } from '../../tools/cli-output-converter.js';
 import { generateSmartContext, formatSmartContext } from '../../tools/smart-context.js';
 import {
@@ -851,6 +852,35 @@ export async function handleCliRoutes(ctx: RouteContext): Promise<boolean> {
     return true;
   }
 
+  // API: List Native CLI Sessions
+  if (pathname === '/api/cli/native-sessions' && req.method === 'GET') {
+    const projectPath = url.searchParams.get('path') || null;
+    const limit = parseInt(url.searchParams.get('limit') || '100', 10);
+
+    try {
+      const sessions = listAllNativeSessions({
+        workingDir: projectPath || undefined,
+        limit
+      });
+
+      // Group sessions by tool
+      const byTool: Record<string, typeof sessions> = {};
+      for (const session of sessions) {
+        if (!byTool[session.tool]) {
+          byTool[session.tool] = [];
+        }
+        byTool[session.tool].push(session);
+      }
+
+      res.writeHead(200, { 'Content-Type': 'application/json' });
+      res.end(JSON.stringify({ sessions, byTool }));
+    } catch (err) {
+      res.writeHead(500, { 'Content-Type': 'application/json' });
+      res.end(JSON.stringify({ error: (err as Error).message }));
+    }
+    return true;
+  }
+
   // API: Execute CLI Tool
   if (pathname === '/api/cli/execute' && req.method === 'POST') {
     handlePostRequest(req, res, async (body) => {