refactor: divide agent logic and gateway into different package (#90)

* feat: add @memoh/agent

* chore: use @memoh/agent in @memoh-gateway

packages/agent/package.json

@@ -0,0 +1,26 @@
+{
+  "name": "@memoh/agent",
+  "version": "0.1.0-beta.5",
+  "exports": {
+    ".": "./src/index.ts"
+  },
+  "packageManager": "pnpm@10.27.0",
+  "module": "src/index.ts",
+  "type": "module",
+  "private": true,
+  "peerDependencies": {
+    "typescript": "^5"
+  },
+  "dependencies": {
+    "@ai-sdk/anthropic": "^3.0.9",
+    "@ai-sdk/google": "^3.0.6",
+    "@ai-sdk/mcp": "^1.0.6",
+    "@ai-sdk/openai": "^3.0.7",
+    "@mozilla/readability": "^0.6.0",
+    "ai": "^6.0.25",
+    "jsdom": "^27.4.0",
+    "toml": "^3.0.0",
+    "turndown": "^7.2.2",
+    "zod": "^4.3.6"
+  }
+}