Add TypeDoc for API documentation generation

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

typedoc.json

@@ -0,0 +1,10 @@
+{
+  "$schema": "https://typedoc.org/schema.json",
+  "entryPoints": ["src/**/*.ts", "src/**/*.js"],
+  "exclude": ["src/**/*.d.ts"],
+  "out": "docs",
+  "name": "Lucia Frontend",
+  "includeVersion": true,
+  "tsconfig": "tsconfig.json",
+  "skipErrorChecking": true
+}