feat: add @automaker/model-resolver package

- Extract model string resolution logic
- Map model aliases to full model strings (haiku -> claude-haiku-4-5)
- Handle multiple model sources with priority
- Re-export model constants from @automaker/types

Provides centralized model resolution for Claude models.
Simplifies model handling across server and UI.

Dependencies: @automaker/types

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

libs/model-resolver/package.json

@@ -0,0 +1,21 @@
+{
+  "name": "@automaker/model-resolver",
+  "version": "1.0.0",
+  "description": "Model resolution utilities for AutoMaker",
+  "main": "dist/index.js",
+  "types": "dist/index.d.ts",
+  "scripts": {
+    "build": "tsc",
+    "watch": "tsc --watch"
+  },
+  "keywords": ["automaker", "model", "resolver"],
+  "author": "",
+  "license": "MIT",
+  "dependencies": {
+    "@automaker/types": "^1.0.0"
+  },
+  "devDependencies": {
+    "@types/node": "^22.10.5",
+    "typescript": "^5.7.3"
+  }
+}