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.

libs/prompts/package.json

@@ -0,0 +1,25 @@
+{
+  "name": "@automaker/prompts",
+  "version": "1.0.0",
+  "type": "module",
+  "description": "AI prompt templates for AutoMaker",
+  "main": "dist/index.js",
+  "types": "dist/index.d.ts",
+  "scripts": {
+    "build": "tsc",
+    "watch": "tsc --watch",
+    "test": "vitest run",
+    "test:watch": "vitest"
+  },
+  "keywords": ["automaker", "prompts", "ai"],
+  "author": "AutoMaker Team",
+  "license": "SEE LICENSE IN LICENSE",
+  "dependencies": {
+    "@automaker/types": "^1.0.0"
+  },
+  "devDependencies": {
+    "@types/node": "^22.10.5",
+    "typescript": "^5.7.3",
+    "vitest": "^4.0.16"
+  }
+}