Add grouping categories feature

server.ts

@@ -449,6 +449,40 @@ app.get("/api/feeds/:feedId/episodes", async (c) => {
   }
 });
 
+app.get("/api/categories", async (c) => {
+  try {
+    const { getAllCategories } = await import("./services/database.js");
+    const categories = await getAllCategories();
+    return c.json({ categories });
+  } catch (error) {
+    console.error("Error fetching categories:", error);
+    return c.json({ error: "Failed to fetch categories" }, 500);
+  }
+});
+
+app.get("/api/feeds/by-category", async (c) => {
+  try {
+    const category = c.req.query("category");
+    const { getFeedsByCategory } = await import("./services/database.js");
+    const feeds = await getFeedsByCategory(category);
+    return c.json({ feeds });
+  } catch (error) {
+    console.error("Error fetching feeds by category:", error);
+    return c.json({ error: "Failed to fetch feeds by category" }, 500);
+  }
+});
+
+app.get("/api/feeds/grouped-by-category", async (c) => {
+  try {
+    const { getFeedsGroupedByCategory } = await import("./services/database.js");
+    const groupedFeeds = await getFeedsGroupedByCategory();
+    return c.json({ groupedFeeds });
+  } catch (error) {
+    console.error("Error fetching feeds grouped by category:", error);
+    return c.json({ error: "Failed to fetch feeds grouped by category" }, 500);
+  }
+});
+
 app.get("/api/episode-with-source/:episodeId", async (c) => {
   try {
     const episodeId = c.req.param("episodeId");