feat: add shared TypeScript types for Game, Documentary, Chapter

Create @afterlife/shared package with type definitions for the core
domain models (Game, Documentary, Chapter) and Strapi API interfaces
(StrapiMedia, StrapiResponse, StrapiListResponse).

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

package-lock.json

@@ -13,6 +13,10 @@
         "turbo": "^2"
       }
     },
+    "node_modules/@afterlife/shared": {
+      "resolved": "packages/shared",
+      "link": true
+    },
     "node_modules/turbo": {
       "version": "2.8.10",
       "resolved": "https://registry.npmjs.org/turbo/-/turbo-2.8.10.tgz",
@@ -107,6 +111,25 @@
       "os": [
         "win32"
       ]
+    },
+    "node_modules/typescript": {
+      "version": "5.9.3",
+      "resolved": "https://registry.npmjs.org/typescript/-/typescript-5.9.3.tgz",
+      "integrity": "sha512-jl1vZzPDinLr9eUt3J/t7V6FgNEw9QjvBPdysz9KfQDD41fQrC2Y4vKQdiaUpFT4bXlb1RHhLpp8wtm6M5TgSw==",
+      "dev": true,
+      "bin": {
+        "tsc": "bin/tsc",
+        "tsserver": "bin/tsserver"
+      },
+      "engines": {
+        "node": ">=14.17"
+      }
+    },
+    "packages/shared": {
+      "version": "0.1.0",
+      "devDependencies": {
+        "typescript": "^5"
+      }
     }
   }
 }