feat(rpc): scaffold the package and shared contract types

bun.lock

@@ -444,6 +444,20 @@
         "@wrnexus/core": "workspace:*",
       },
     },
+    "packages/rpc": {
+      "name": "@wrnexus/rpc",
+      "version": "0.8.4",
+      "dependencies": {
+        "@wrnexus/authz": "workspace:*",
+        "@wrnexus/core": "workspace:*",
+        "@wrnexus/jwt": "workspace:*",
+        "@wrnexus/validation": "workspace:*",
+      },
+      "devDependencies": {
+        "@types/bun": "^1.3.14",
+        "typescript": "^5.9.2",
+      },
+    },
     "packages/security": {
       "name": "@wrnexus/security",
       "version": "0.8.4",
@@ -887,6 +901,8 @@
 
     "@wrnexus/router": ["@wrnexus/router@workspace:packages/router"],
 
+    "@wrnexus/rpc": ["@wrnexus/rpc@workspace:packages/rpc"],
+
     "@wrnexus/security": ["@wrnexus/security@workspace:packages/security"],
 
     "@wrnexus/ssr": ["@wrnexus/ssr@workspace:packages/ssr"],