feat: refactored docs structure

apps/docs/lib/env.d.ts

@@ -0,0 +1,14 @@
+// Islands and the Blume modules they import (blume/components/islands/
+// base-path.ts) are bundled by Vite, which provides import.meta.env. Vite is
+// Blume's dependency, not this workspace's, so its client types are not
+// resolvable from here; this mirrors the slice of them (ImportMetaEnv) tsc needs.
+interface ImportMeta {
+  readonly env: {
+    readonly [key: string]: unknown;
+    readonly BASE_URL: string;
+    readonly MODE: string;
+    readonly DEV: boolean;
+    readonly PROD: boolean;
+    readonly SSR: boolean;
+  };
+}