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

web/messaging/README.md

@@ -0,0 +1,35 @@
+# KosmoConnect Messaging Client
+
+A subscriber-only web application for sending and receiving messages with the Meshtastic mesh network.
+
+## Tech Stack
+
+- **React 18** + **Vite**
+- Plain CSS (no heavy UI framework)
+
+## Running Locally
+
+Make sure the **Gateway Service** is running on `http://localhost:8003` (see `backend/gateway/README.md`).
+
+```bash
+cd web/messaging
+npm install
+npm run dev
+```
+
+Open http://localhost:3001 in your browser.
+
+## Features (v0.1)
+
+- **User switcher** (dev mode): select between test subscription tiers (Wanderer / Guardian)
+- **Conversation list**: auto-refreshing sidebar with latest message preview and unread badges
+- **Message thread**: chat-style bubbles with timestamps and delivery status indicators
+  - `⏳` pending / `✓` queued / `✓✓` transmitted or delivered
+- **Auto-refresh**: polls for new replies every 5 seconds
+- **Subscription enforcement**: errors surfaced as browser alerts (e.g., quota exceeded, node not allowed)
+
+## Architecture Notes
+
+- The Vite dev server proxies `/api` requests to `localhost:8003` to avoid CORS issues during development.
+- In production, the messaging client is served as static files and talks directly to the API gateway host.
+- Authentication is currently mocked with a simple `X-User-ID` header selector. Production will use JWT.