feat(server): add card CRUD endpoints

Implement card management API with create, read, update, and delete
operations. Cards are nested under decks (/api/decks/:deckId/cards)
with deck ownership verification on all operations.

- Add Card interface and CardRepository to repository types
- Create cardRepository with CRUD operations and soft delete
- Add card routes with Zod validation and auth middleware
- Include 29 tests covering all endpoints and error cases

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

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

1 files changed, 3 insertions, 2 deletions

diff --git a/src/server/index.ts b/src/server/index.ts
index bcedb4e..d00564f 100644
--- a/src/server/index.ts
+++ b/src/server/index.ts
@@ -2,7 +2,7 @@ import { serve } from "@hono/node-server";
 import { Hono } from "hono";
 import { logger } from "hono/logger";
 import { errorHandler } from "./middleware/index.js";
-import { auth, decks } from "./routes/index.js";
+import { auth, cards, decks } from "./routes/index.js";
 
 const app = new Hono();
 
@@ -18,7 +18,8 @@ const routes = app
 		return c.json({ status: "ok" }, 200);
 	})
 	.route("/api/auth", auth)
-	.route("/api/decks", decks);
+	.route("/api/decks", decks)
+	.route("/api/decks/:deckId/cards", cards);
 
 export type AppType = typeof routes;