feat: implement find_all method in ChannelRepository and update related services and routes for public access

k-tv-frontend/app/api/stream/[channelId]/route.ts

@@ -27,14 +27,12 @@ export async function GET(
   const { channelId } = await params;
   const token = request.nextUrl.searchParams.get("token");
 
-  if (!token) {
-    return new Response(null, { status: 401 });
-  }
-
   let res: Response;
   try {
+    const headers: Record<string, string> = {};
+    if (token) headers["Authorization"] = `Bearer ${token}`;
     res = await fetch(`${API_URL}/channels/${channelId}/stream`, {
-      headers: { Authorization: `Bearer ${token}` },
+      headers,
       redirect: "manual",
     });
   } catch {