fix: export web search config contract from plugin sdk package

Author: steipete

packages/plugin-sdk/package.json

@@ -112,6 +112,10 @@
       "types": "./dist/src/plugin-sdk/provider-web-search-contract.d.ts",
       "default": "./src/provider-web-search-contract.ts"
     },
+    "./provider-web-search-config-contract": {
+      "types": "./dist/src/plugin-sdk/provider-web-search-config-contract.d.ts",
+      "default": "./src/provider-web-search-config-contract.ts"
+    },
     "./runtime-doctor": {
       "types": "./dist/src/plugin-sdk/runtime-doctor.d.ts",
       "default": "./src/runtime-doctor.ts"