feat: add AI enhancement feature to settings and board views

- Introduced AIEnhancementSection to settings view for selecting enhancement models.
- Implemented enhancement functionality in AddFeatureDialog and EditFeatureDialog, allowing users to enhance feature descriptions with AI.
- Added dropdown menu for selecting enhancement modes (improve, technical, simplify, acceptance).
- Integrated new API endpoints for enhancing text using Claude AI.
- Updated navigation to include AI enhancement section in settings.

This enhances user experience by providing AI-powered text enhancement capabilities directly within the application.

apps/server/src/routes/enhance-prompt/index.ts

@@ -0,0 +1,22 @@
+/**
+ * Enhance prompt routes - HTTP API for AI-powered text enhancement
+ *
+ * Provides endpoints for enhancing user input text using Claude AI
+ * with different enhancement modes (improve, expand, simplify, etc.)
+ */
+
+import { Router } from "express";
+import { createEnhanceHandler } from "./routes/enhance.js";
+
+/**
+ * Create the enhance-prompt router
+ *
+ * @returns Express router with enhance-prompt endpoints
+ */
+export function createEnhancePromptRoutes(): Router {
+  const router = Router();
+
+  router.post("/", createEnhanceHandler());
+
+  return router;
+}