feat(client): add push service for sync implementation

Implement PushService class to push local changes to server:
- Convert local decks, cards, and review logs to API format
- Push pending changes to server endpoint
- Mark items as synced after successful push
- Return conflicts reported by server (LWW resolution)

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

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

1 files changed, 12 insertions, 0 deletions

diff --git a/src/client/sync/index.ts b/src/client/sync/index.ts
index 6f75a29..76f5081 100644
--- a/src/client/sync/index.ts
+++ b/src/client/sync/index.ts
@@ -7,3 +7,15 @@ export {
 	type SyncQueueState,
 	type SyncStatusType,
 } from "./queue";
+
+export {
+	createPushService,
+	pendingChangesToPushData,
+	PushService,
+	type PushServiceOptions,
+	type SyncCardData,
+	type SyncDeckData,
+	type SyncPushData,
+	type SyncPushResult,
+	type SyncReviewLogData,
+} from "./push";