feat: initial KosmoConnect platform v0.1

Includes:
- Backend services: ingestion (:8001), weather API (:8002),
  gateway (:8003), billing (:8004) with BTCPay integration
- Shared asyncpg pool, TimescaleDB hypertable, Redis, Mosquitto MQTT
- React frontend: Dashboard (MapLibre) and Messaging (chat UI)
- Bridge daemon for Pi + Meshtastic (Serial/TCP T-Deck support)
- Production Docker Compose, Nginx reverse proxy, ops scripts
- DEPLOY.md with step-by-step deployment guide

firmware/infrastructure-node/README.md

@@ -0,0 +1,43 @@
+# Infrastructure Node
+
+This directory contains the software for bridge nodes that connect the Meshtastic mesh to the internet.
+
+## Components
+
+### `bridge-daemon/`
+The **KosmoConnect Bridge Daemon** is a Python service that runs on a Raspberry Pi (or any Linux host) connected to a Meshtastic device via USB.
+
+**What it does:**
+- Receives mesh packets and publishes them to the cloud MQTT broker
+- Detects environmental data (JSON enviro packets) and routes them to `kosmo/ingest/enviro`
+- Subscribes to `kosmo/mesh/outbound/#` and injects web messages back into the mesh
+- Runs as a `systemd` service with auto-restart
+
+See [`bridge-daemon/README.md`](./bridge-daemon/README.md) for setup and RPi installation instructions.
+
+### `firmware/`
+Placeholder for any custom firmware required specifically for the bridge radio (usually not needed; standard Meshtastic firmware works).
+
+## Recommended Bridge Hardware
+
+| Device | Notes |
+|--------|-------|
+| **LILYGO T-Beam 868/915MHz** | Great for Pi USB bridge; ESP32 + GPS + LoRa |
+| **RAK4631** | Low power, nRF52840 based |
+| **LILYGO T-Deck** | Can work if put into USB-serial mode; better used as a handheld mesh client |
+
+## Quick Test
+
+If you have a T-Beam or T-Deck connected to your computer:
+
+```bash
+cd bridge-daemon
+python3 -m venv venv
+source venv/bin/activate
+pip install -r requirements.txt
+export MESHTASTIC_DEVICE=/dev/ttyUSB0   # adjust for your OS
+export MQTT_HOST=localhost
+python3 -m src.main
+```
+
+Send a text from any mesh node and watch it appear on `kosmo/mesh/inbound` in your MQTT broker.