feat: add TypeScript type definitions to server exports

Added TypeScript .d.ts type exports to package.json exports field
for the aidd/server module, enabling proper TypeScript support and
IDE autocompletion for the server framework utilities.

The exports now include both the JavaScript implementation and
TypeScript type definitions:
- ./server: points to both index.js and index.d.ts

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

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

Author: claude

package.json

@@ -21,7 +21,10 @@
   },
   "exports": {
     ".": "./index.js",
-    "./server": "./src/server/index.js"
+    "./server": {
+      "types": "./src/server/index.d.ts",
+      "default": "./src/server/index.js"
+    }
   },
   "files": [
     "ai/**/*",