Add device-side log file, remote terminal, and streaming error reporting

IPTV.py now writes logs to a rotating file and forwards critical VLC
playback errors (start timeout, MediaPlayerEncounteredError) to the
server instead of losing everything to unredirected print() calls.
The web UI's device menu gets a working Terminal (to run diagnostic
commands like tail on the log) and a Recent errors view backed by a
capped last_errors list on each device document, keeping DB volume
bounded to the last 5 entries per device.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

server.py

@@ -74,6 +74,7 @@ recents =  db_iptv['recents']
 settings_collection = db_iptv['settings']
 
 devices_db = db_iptv['devices']
+MAX_STREAMING_ERRORS_PER_DEVICE = 5
 devices = []
 active_xtream_imports = {}
 sio_session_ips = {}
@@ -1471,6 +1472,21 @@ async def communication(fromSid, data):
     await sio.emit('communication', data, room=toSidDevice ,callback=messageReceived)
 
 
+@sio.event
+async def streaming_error(sid, data):
+    IdDevice = data.get('IdDevice')
+    message = data.get('message', '')
+    if not IdDevice:
+        return
+
+    print('streaming_error from device :', IdDevice, message, flush=True)
+    error_entry = {'message': str(message)[:500], 'timestamp': time.time()}
+    devices_db.update_one(
+        {'id_device': IdDevice},
+        {'$push': {'last_errors': {'$each': [error_entry], '$slice': -MAX_STREAMING_ERRORS_PER_DEVICE}}}
+    )
+
+
 @sio.event
 def disconnect(sid):
     sio_session_ips.pop(sid, None)