fix(server): use explicit #[get] and #[post] attributes for server endpoints

Replace #[server(endpoint = "...")] with explicit HTTP method attributes
to ensure correct method handling behind Traefik reverse proxy.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/pages/dashboard.rs

@@ -329,7 +329,7 @@ pub fn DashboardPage() -> Element {
                                                             .set(
                                                                 format!(
                                                                     "Article content:\n{snippet}\n\n\
-                                                                                                                                                                                                                                                 AI Summary:\n{text}",
+                                                                                                                                                                         AI Summary:\n{text}",
                                                                 ),
                                                             );
                                                         summary.set(Some(text));
@@ -385,9 +385,9 @@ pub fn DashboardPage() -> Element {
                                             role: "system".into(),
                                             content: format!(
                                                 "You are a helpful assistant. The user is reading \
-                                                                                                                                                                     a news article. Use the following context to answer \
+                                                                                                                     a news article. Use the following context to answer \
-                                                                                                                                                                     their questions. Do NOT comment on the source, \
+                                                                                                                     their questions. Do NOT comment on the source, \
-                                                                                                                                                                     dates, URLs, or formatting.\n\n{ctx}",
+                                                                                                                     dates, URLs, or formatting.\n\n{ctx}",
                                             ),
                                         },
                                     ];