fix: address PR comments and complete prompt centralization

- Fix inline type imports in defaults.ts (move to top-level imports)
- Update ideation-service.ts to use centralized prompts from settings
- Update generate-title.ts to use centralized prompts
- Update validate-issue.ts to use centralized prompts
- Clean up validation-schema.ts (prompts already centralized)
- Minor server index cleanup

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

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

@@ -4,6 +4,7 @@
 
 import { Router } from 'express';
 import { FeatureLoader } from '../../services/feature-loader.js';
+import type { SettingsService } from '../../services/settings-service.js';
 import { validatePathParams } from '../../middleware/validate-paths.js';
 import { createListHandler } from './routes/list.js';
 import { createGetHandler } from './routes/get.js';
@@ -15,7 +16,10 @@ import { createDeleteHandler } from './routes/delete.js';
 import { createAgentOutputHandler, createRawOutputHandler } from './routes/agent-output.js';
 import { createGenerateTitleHandler } from './routes/generate-title.js';
 
-export function createFeaturesRoutes(featureLoader: FeatureLoader): Router {
+export function createFeaturesRoutes(
+  featureLoader: FeatureLoader,
+  settingsService?: SettingsService
+): Router {
   const router = Router();
 
   router.post('/list', validatePathParams('projectPath'), createListHandler(featureLoader));
@@ -35,7 +39,7 @@ export function createFeaturesRoutes(featureLoader: FeatureLoader): Router {
   router.post('/delete', validatePathParams('projectPath'), createDeleteHandler(featureLoader));
   router.post('/agent-output', createAgentOutputHandler(featureLoader));
   router.post('/raw-output', createRawOutputHandler(featureLoader));
-  router.post('/generate-title', createGenerateTitleHandler());
+  router.post('/generate-title', createGenerateTitleHandler(settingsService));
 
   return router;
 }