feat: Introduce @automaker/prompts package for AI prompt templates

Changes:
- Added a new package, @automaker/prompts, containing AI prompt templates for enhancing user-written task descriptions.
- Implemented four enhancement modes: improve, technical, simplify, and acceptance, each with corresponding system prompts and examples.
- Updated relevant packages to utilize the new prompts package, ensuring backward compatibility with existing imports.
- Enhanced documentation to include usage examples and integration details for the new prompts.

Benefits:
✅ Streamlined AI prompt management across the codebase
✅ Improved clarity and usability for AI-powered features
✅ Comprehensive documentation for developers

All tests passing.

apps/ui/src/components/ui/description-image-dropzone.tsx

@@ -4,14 +4,7 @@ import { cn } from "@/lib/utils";
 import { ImageIcon, X, Loader2 } from "lucide-react";
 import { Textarea } from "@/components/ui/textarea";
 import { getElectronAPI } from "@/lib/electron";
-import { useAppStore } from "@/store/app-store";
-
-export interface FeatureImagePath {
-  id: string;
-  path: string; // Path to the temp file
-  filename: string;
-  mimeType: string;
-}
+import { useAppStore, type FeatureImagePath } from "@/store/app-store";
 
 // Map to store preview data by image ID (persisted across component re-mounts)
 export type ImagePreviewMap = Map<string, string>;

apps/ui/src/components/views/board-view/shared/model-constants.ts

@@ -1,4 +1,4 @@
-import { AgentModel, ThinkingLevel } from "@/store/app-store";
+import type { AgentModel, ThinkingLevel } from "@/store/app-store";
 import {
   Brain,
   Zap,