examples: add local config templates for MQTT and serial simulator

examples/config.local.mqtt.ini

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+; examples/config.local.mqtt.ini
+; Local config for testing the bridge with a local MQTT broker (recommended)
+
+[DEFAULT]
+MESHTASTIC_SERIAL_PORT = /dev/ttyUSB0
+EXTERNAL_TRANSPORT = mqtt
+
+; MQTT settings
+MQTT_BROKER = localhost
+MQTT_PORT = 1883
+MQTT_TOPIC_IN = ammb/to_meshtastic
+MQTT_TOPIC_OUT = ammb/from_meshtastic
+MQTT_CLIENT_ID = ammb_test_client
+MQTT_QOS = 0
+MQTT_RETAIN_OUT = False
+
+; Bridge & common
+EXTERNAL_NETWORK_ID = test_net
+BRIDGE_NODE_ID = !ammb_test
+MESSAGE_QUEUE_SIZE = 100
+LOG_LEVEL = DEBUG
+
+; API (optional)
+API_ENABLED = True
+API_HOST = 127.0.0.1
+API_PORT = 8080

examples/config.local.serial.ini

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+; examples/config.local.serial.ini
+; Local config for testing the bridge with a serial simulator (Windows example)
+
+[DEFAULT]
+MESHTASTIC_SERIAL_PORT = COM5     ; simulator writes here
+EXTERNAL_TRANSPORT = serial
+
+; Serial settings (external transport)
+SERIAL_PORT = COM6                ; bridge connects to this (simulator pairs with COM5)
+SERIAL_BAUD_RATE = 9600
+SERIAL_PROTOCOL = json_newline
+
+; Bridge & common
+EXTERNAL_NETWORK_ID = test_net
+BRIDGE_NODE_ID = !ammb_test
+MESSAGE_QUEUE_SIZE = 100
+LOG_LEVEL = DEBUG
+
+; API (optional)
+API_ENABLED = False