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

backend/README.md

@@ -0,0 +1,93 @@
+# KosmoConnect Backend
+
+This directory contains the cloud backend services for KosmoConnect.
+
+## Quick Start
+
+### 1. Start Infrastructure Services
+
+You need Docker running on your machine.
+
+```bash
+cd backend
+docker-compose up -d
+```
+
+This starts:
+- **TimescaleDB** on port `5432`
+- **Redis** on port `6379`
+- **RabbitMQ** on port `5672` (management UI on `15672`)
+- **Mosquitto MQTT** on port `1883`
+
+The first time TimescaleDB starts, it will automatically run the migration in `migrations/001_initial_schema.sql`.
+
+### 2. Install Python Dependencies
+
+```bash
+python3 -m venv .venv
+source .venv/bin/activate
+pip install -r requirements.txt
+```
+
+### 3. Run the Services
+
+In terminal 1:
+```bash
+./run-dev.sh ingestion
+```
+
+In terminal 2:
+```bash
+./run-dev.sh api
+```
+
+- API docs: http://localhost:8002/docs
+- Ingestion health: http://localhost:8001/health
+
+### 4. Simulate Data (No Hardware Needed)
+
+In terminal 3:
+```bash
+cd ..
+python3 -m venv .venv
+source .venv/bin/activate
+pip install -r backend/requirements.txt
+python3 scripts/simulate-bridge.py --interval 5
+```
+
+This publishes fake environmental readings every 5 seconds. The ingestion service will pick them up and write them to TimescaleDB. You can then query the API:
+
+```bash
+curl "http://localhost:8002/api/v1/weather/latest"
+```
+
+## Service Architecture
+
+| Service | Port | Responsibility |
+|---------|------|----------------|
+| API | 8002 | REST API for dashboard and web clients |
+| Ingestion | 8001 | Subscribes to MQTT, writes sensor data to TimescaleDB |
+| Gateway | 8003 | Web-to-mesh message queue, delivery tracking, and subscription enforcement |
+| Billing | 8004 | BTCPay Server integration for subscriptions and invoices |
+
+## Database Schema
+
+- **nodes**: Registry of all enviro-nodes and infrastructure nodes
+- **enviro_readings**: Time-series hypertable for sensor data
+- **mesh_messages**: Delivery tracking for gateway messages
+- **users / subscriptions / allowed_nodes**: Subscriber management
+
+## Environment Variables
+
+Copy `.env.example` to `.env` and customize:
+
+```bash
+cp .env.example .env
+```
+
+| Variable | Default | Description |
+|----------|---------|-------------|
+| `DATABASE_URL` | `postgresql://kosmo:kosmo_dev_pass@localhost:5432/kosmoconnect` | TimescaleDB connection |
+| `MQTT_HOST` | `localhost` | MQTT broker host |
+| `MQTT_PORT` | `1883` | MQTT broker port |
+| `MQTT_TOPIC` | `kosmo/ingest/enviro` | Topic for enviro data |