feat: implement ideation feature for brainstorming and idea management

- Introduced a new IdeationService to manage brainstorming sessions, including idea creation, analysis, and conversion to features.
- Added RESTful API routes for ideation, including session management, idea CRUD operations, and suggestion generation.
- Created UI components for the ideation dashboard, prompt selection, and category grid to enhance user experience.
- Integrated keyboard shortcuts and navigation for the ideation feature, improving accessibility and workflow.
- Updated state management with Zustand to handle ideation-specific data and actions.
- Added necessary types and paths for ideation functionality, ensuring type safety and clarity in the codebase.

apps/server/src/routes/ideation/index.ts

@@ -0,0 +1,99 @@
+/**
+ * Ideation routes - HTTP API for brainstorming and idea management
+ */
+
+import { Router } from 'express';
+import { validatePathParams } from '../../middleware/validate-paths.js';
+import type { IdeationService } from '../../services/ideation-service.js';
+import type { FeatureLoader } from '../../services/feature-loader.js';
+
+// Route handlers
+import { createSessionStartHandler } from './routes/session-start.js';
+import { createSessionMessageHandler } from './routes/session-message.js';
+import { createSessionStopHandler } from './routes/session-stop.js';
+import { createSessionGetHandler } from './routes/session-get.js';
+import { createIdeasListHandler } from './routes/ideas-list.js';
+import { createIdeasCreateHandler } from './routes/ideas-create.js';
+import { createIdeasGetHandler } from './routes/ideas-get.js';
+import { createIdeasUpdateHandler } from './routes/ideas-update.js';
+import { createIdeasDeleteHandler } from './routes/ideas-delete.js';
+import { createAnalyzeHandler, createGetAnalysisHandler } from './routes/analyze.js';
+import { createConvertHandler } from './routes/convert.js';
+import { createPromptsHandler, createPromptsByCategoryHandler } from './routes/prompts.js';
+import { createSuggestionsGenerateHandler } from './routes/suggestions-generate.js';
+
+export function createIdeationRoutes(
+  ideationService: IdeationService,
+  featureLoader: FeatureLoader
+): Router {
+  const router = Router();
+
+  // Session management
+  router.post(
+    '/session/start',
+    validatePathParams('projectPath'),
+    createSessionStartHandler(ideationService)
+  );
+  router.post('/session/message', createSessionMessageHandler(ideationService));
+  router.post('/session/stop', createSessionStopHandler(ideationService));
+  router.post(
+    '/session/get',
+    validatePathParams('projectPath'),
+    createSessionGetHandler(ideationService)
+  );
+
+  // Ideas CRUD
+  router.post(
+    '/ideas/list',
+    validatePathParams('projectPath'),
+    createIdeasListHandler(ideationService)
+  );
+  router.post(
+    '/ideas/create',
+    validatePathParams('projectPath'),
+    createIdeasCreateHandler(ideationService)
+  );
+  router.post(
+    '/ideas/get',
+    validatePathParams('projectPath'),
+    createIdeasGetHandler(ideationService)
+  );
+  router.post(
+    '/ideas/update',
+    validatePathParams('projectPath'),
+    createIdeasUpdateHandler(ideationService)
+  );
+  router.post(
+    '/ideas/delete',
+    validatePathParams('projectPath'),
+    createIdeasDeleteHandler(ideationService)
+  );
+
+  // Project analysis
+  router.post('/analyze', validatePathParams('projectPath'), createAnalyzeHandler(ideationService));
+  router.post(
+    '/analysis',
+    validatePathParams('projectPath'),
+    createGetAnalysisHandler(ideationService)
+  );
+
+  // Convert to feature
+  router.post(
+    '/convert',
+    validatePathParams('projectPath'),
+    createConvertHandler(ideationService, featureLoader)
+  );
+
+  // Guided prompts (no validation needed - static data)
+  router.get('/prompts', createPromptsHandler(ideationService));
+  router.get('/prompts/:category', createPromptsByCategoryHandler(ideationService));
+
+  // Generate suggestions (structured output)
+  router.post(
+    '/suggestions/generate',
+    validatePathParams('projectPath'),
+    createSuggestionsGenerateHandler(ideationService)
+  );
+
+  return router;
+}