feat(26-02): discovery HTTP routes, server registration, and route tests

- Create src/server/routes/discovery.ts with GET /setups, /items, /categories handlers
- Register discoveryRoutes in src/server/index.ts with browseTier rate limiting
- Add auth skip for /api/discovery/* GET requests in auth middleware
- Create tests/routes/discovery.test.ts with 10 tests covering all endpoints and pagination

src/server/routes/discovery.ts

@@ -0,0 +1,38 @@
+import { Hono } from "hono";
+import {
+	getPopularSetups,
+	getRecentGlobalItems,
+	getTrendingCategories,
+} from "../services/discovery.service.ts";
+
+type Env = { Variables: { db?: any } };
+
+const app = new Hono<Env>();
+
+app.get("/setups", async (c) => {
+	const db = c.get("db");
+	const limitParam = c.req.query("limit");
+	const cursor = c.req.query("cursor");
+	const limit = Math.min(limitParam ? parseInt(limitParam, 10) || 6 : 6, 50);
+	const result = await getPopularSetups(db, limit, cursor);
+	return c.json(result);
+});
+
+app.get("/items", async (c) => {
+	const db = c.get("db");
+	const limitParam = c.req.query("limit");
+	const cursor = c.req.query("cursor");
+	const limit = Math.min(limitParam ? parseInt(limitParam, 10) || 8 : 8, 50);
+	const result = await getRecentGlobalItems(db, limit, cursor);
+	return c.json(result);
+});
+
+app.get("/categories", async (c) => {
+	const db = c.get("db");
+	const limitParam = c.req.query("limit");
+	const limit = Math.min(limitParam ? parseInt(limitParam, 10) || 12 : 12, 50);
+	const result = await getTrendingCategories(db, limit);
+	return c.json(result);
+});
+
+export { app as discoveryRoutes };