fix(memory): convert to modern TypeScript SDK APIs (#3015)

* fix(memory): convert to modern TypeScript SDK APIs

Convert the memory server to use the modern McpServer API instead of
the low-level Server API.

Key changes:
- Replace Server with McpServer from @modelcontextprotocol/sdk/server/mcp.js
- Convert all 9 tools to use registerTool() instead of manual request handlers
- Create reusable Zod schemas for Entity and Relation types
- Use Zod schemas directly in inputSchema/outputSchema
- Add structuredContent to all tool responses
- Fix type literals to use 'as const' assertions

The modern API provides:
- Less boilerplate code (removed ~200 lines of schema definitions)
- Better type safety with Zod
- More declarative tool registration
- Cleaner, more maintainable code

* fix: exclude test files from TypeScript build

Add exclude for test files and vitest.config.ts to tsconfig

src/memory/tsconfig.json

@@ -1,11 +1,14 @@
 {
-    "extends": "../../tsconfig.json",
-    "compilerOptions": {
-      "outDir": "./dist",
-      "rootDir": "."
-    },
-    "include": [
-      "./**/*.ts"
-    ]
-  }
-  
+  "extends": "../../tsconfig.json",
+  "compilerOptions": {
+    "outDir": "./dist",
+    "rootDir": "."
+  },
+  "include": [
+    "./**/*.ts"
+  ],
+  "exclude": [
+    "**/*.test.ts",
+    "vitest.config.ts"
+  ]
+}