refactor: reorganize package exports under namespaced paths

- Prefix feature exports with `features/` (auth, admin, provider)
- Prefix shared exports with `shared/` (components, icons, lib, config, logger, rate-limit)
- Add new explicit exports for `shared/logger`, `shared/config`, and `shared/rate-limit`
- Update internal imports to use package self-referencing (`@zen/core/shared/*`) instead of relative paths

package.json

@@ -49,36 +49,39 @@
     ".": {
       "import": "./dist/index.js"
     },
-    "./auth": {
+    "./features/auth": {
       "import": "./dist/features/auth/index.js"
     },
-    "./auth/actions": {
+    "./features/auth/actions": {
       "import": "./dist/features/auth/actions.js"
     },
-    "./auth/pages": {
+    "./features/auth/pages": {
       "import": "./dist/features/auth/pages.js"
     },
-    "./auth/page": {
+    "./features/auth/page": {
       "import": "./dist/features/auth/page.js"
     },
-    "./auth/components": {
+    "./features/auth/components": {
       "import": "./dist/features/auth/components/index.js"
     },
-    "./admin": {
+    "./features/admin": {
       "import": "./dist/features/admin/index.js"
     },
-    "./admin/actions": {
+    "./features/admin/actions": {
       "import": "./dist/features/admin/actions.js"
     },
-    "./admin/navigation": {
+    "./features/admin/navigation": {
       "import": "./dist/features/admin/navigation.server.js"
     },
-    "./admin/pages": {
+    "./features/admin/pages": {
       "import": "./dist/features/admin/pages.js"
     },
-    "./admin/page": {
+    "./features/admin/page": {
       "import": "./dist/features/admin/page.js"
     },
+    "./features/provider": {
+      "import": "./dist/features/provider/index.js"
+    },
     "./api": {
       "import": "./dist/core/api/index.js"
     },
@@ -112,18 +115,24 @@
     "./toast": {
       "import": "./dist/core/toast/index.js"
     },
-    "./provider": {
-      "import": "./dist/features/provider/index.js"
-    },
-    "./lib/metadata": {
-      "import": "./dist/shared/lib/metadata/index.js"
-    },
-    "./components": {
+    "./shared/components": {
       "import": "./dist/shared/components/index.js"
     },
-    "./icons": {
+    "./shared/icons": {
       "import": "./dist/shared/Icons.js"
     },
+    "./shared/lib/metadata": {
+      "import": "./dist/shared/lib/metadata/index.js"
+    },
+    "./shared/logger": {
+      "import": "./dist/shared/lib/logger.js"
+    },
+    "./shared/config": {
+      "import": "./dist/shared/lib/appConfig.js"
+    },
+    "./shared/rate-limit": {
+      "import": "./dist/shared/lib/rateLimit.js"
+    },
     "./styles/zen.css": {
       "default": "./dist/shared/styles/zen.css"
     }