add mana core

packages/shared-errors/package.json

@@ -0,0 +1,30 @@
+{
+  "name": "@manacore/shared-errors",
+  "version": "0.1.0",
+  "private": true,
+  "description": "Go-like error handling system for Manacore backends",
+  "main": "./src/index.ts",
+  "types": "./src/index.ts",
+  "exports": {
+    ".": "./src/index.ts",
+    "./nestjs": "./src/nestjs/index.ts"
+  },
+  "scripts": {
+    "type-check": "tsc --noEmit",
+    "clean": "rm -rf dist"
+  },
+  "peerDependencies": {
+    "@nestjs/common": ">=10.0.0"
+  },
+  "peerDependenciesMeta": {
+    "@nestjs/common": {
+      "optional": true
+    }
+  },
+  "devDependencies": {
+    "@nestjs/common": "^11.0.17",
+    "@types/express": "^5.0.0",
+    "@types/node": "^22.0.0",
+    "typescript": "^5.9.3"
+  }
+}