feat: SSE support (#162)

* event bus implementation

* update tests

* docs update

* review fixes

* update configs

* fix typo

* frontend changes

* install missing pacakge

* queue processing simplification

frontend/src/hooks/useBuildLogStream.ts

@@ -0,0 +1,70 @@
+/*
+ * Copyright (c) 2021-2026 ahriman team.
+ *
+ * This file is part of ahriman
+ * (see https://github.com/arcan1s/ahriman).
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+import { useQueryClient } from "@tanstack/react-query";
+import { buildEventStreamUrl } from "hooks/useEventStream";
+import type { LogRecord } from "models/LogRecord";
+import type { RepositoryId } from "models/RepositoryId";
+import { useEffect } from "react";
+
+interface BuildLogEvent {
+    created: number;
+    message: string;
+    process_id: string;
+    version: string;
+}
+
+function appendLogRecord(existing: LogRecord[] | undefined, record: LogRecord): LogRecord[] {
+    return [...existing ?? [], record];
+}
+
+export function useBuildLogStream(packageBase: string, repository: RepositoryId): void {
+    const queryClient = useQueryClient();
+
+    useEffect(() => {
+        const source = new EventSource(buildEventStreamUrl(repository, ["build-log"], packageBase));
+
+        source.addEventListener("build-log", (event: MessageEvent<string>) => {
+            const data = JSON.parse(event.data) as BuildLogEvent;
+
+            const record: LogRecord = {
+                created: data.created,
+                message: data.message,
+                process_id: data.process_id,
+                version: data.version,
+            };
+
+            // Append to the all-logs cache
+            queryClient.setQueryData<LogRecord[]>(
+                ["logs", repository.key, packageBase],
+                existing => appendLogRecord(existing, record),
+            );
+
+            // Append to the version-specific cache
+            queryClient.setQueryData<LogRecord[]>(
+                ["logs", repository.key, packageBase, record.version, record.process_id],
+                existing => appendLogRecord(existing, record),
+            );
+        });
+
+        return () => {
+            source.close();
+        };
+    }, [queryClient, packageBase, repository]);
+}