feat: send logs to UI

Added SSE endpoint `/logs/stream` for the UI to listen to logs.

ref: N25B-242

src/control_backend/api/v1/endpoints/logs.py

@@ -0,0 +1,33 @@
+import logging
+
+import zmq
+from fastapi import APIRouter
+from fastapi.responses import StreamingResponse
+from pyjabber.server_parameters import json
+from zmq.asyncio import Context
+
+from control_backend.core.config import settings
+
+logger = logging.getLogger(__name__)
+
+router = APIRouter()
+
+
+@router.get("/logs/stream")
+async def log_stream():
+    context = Context.instance()
+    socket = context.socket(zmq.SUB)
+
+    for level in logging.getLevelNamesMapping():
+        socket.subscribe(topic=level)
+
+    socket.connect(settings.zmq_settings.internal_sub_address)
+
+    async def gen():
+        while True:
+            _, message = await socket.recv_multipart()
+            message = message.decode().strip()
+            json_data = json.dumps(message)
+            yield f"data: {json_data}\n\n"
+
+    return StreamingResponse(gen(), media_type="text/event-stream")

src/control_backend/api/v1/router.py

@@ -1,6 +1,6 @@
 from fastapi.routing import APIRouter
 
-from control_backend.api.v1.endpoints import command, message, sse
+from control_backend.api.v1.endpoints import command, logs, message, sse
 
 api_router = APIRouter()
 
@@ -9,3 +9,5 @@ api_router.include_router(message.router, tags=["Messages"])
 api_router.include_router(sse.router, tags=["SSE"])
 
 api_router.include_router(command.router, tags=["Commands"])
+
+api_router.include_router(logs.router, tags=["Logs"])