Update admin theme/layout and refresh README details.

Align the project baseline with the latest admin interface styling and layout structure while documenting setup and usage updates in README.

packages/shared-types/package.json

@@ -0,0 +1,8 @@
+{
+  "name": "@compton/shared-types",
+  "version": "1.0.0",
+  "private": true,
+  "scripts": {
+    "generate": "node scripts/generate.mjs"
+  }
+}

packages/shared-types/scripts/generate.mjs

@@ -0,0 +1,19 @@
+import { mkdirSync, readFileSync, writeFileSync } from "node:fs";
+import { resolve } from "node:path";
+
+const input = resolve(process.cwd(), "../../apps/api/openapi.json");
+const outputDir = resolve(process.cwd(), "src");
+mkdirSync(outputDir, { recursive: true });
+
+let raw = "{}";
+try {
+  raw = readFileSync(input, "utf8");
+} catch {
+  raw = "{}";
+}
+
+writeFileSync(
+  resolve(outputDir, "index.ts"),
+  `export const openApiSchema = ${raw} as const;\n`,
+  "utf8"
+);