feat(shared): define types (User, Deck, Card, ReviewLog)

Add TypeScript type definitions for core data models used across client
and server. Types are consistent with Drizzle schema defined in server.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

1 files changed, 1 insertions, 1 deletions

diff --git a/pkgs/shared/src/index.ts b/pkgs/shared/src/index.ts
index cb0ff5c..2f88e30 100644
--- a/pkgs/shared/src/index.ts
+++ b/pkgs/shared/src/index.ts
@@ -1 +1 @@
-export {};
+export * from "./types/index.js";