chore: initial commit for v0.0.1

DChain single-node blockchain + React Native messenger client.

Core:
- PBFT consensus with multi-sig validator admission + equivocation slashing
- BadgerDB + schema migration scaffold (CurrentSchemaVersion=0)
- libp2p gossipsub (tx/v1, blocks/v1, relay/v1, version/v1)
- Native Go contracts (username_registry) alongside WASM (wazero)
- WebSocket gateway with topic-based fanout + Ed25519-nonce auth
- Relay mailbox with NaCl envelope encryption (X25519 + Ed25519)
- Prometheus /metrics, per-IP rate limit, body-size cap

Deployment:
- Single-node compose (deploy/single/) with Caddy TLS + optional Prometheus
- 3-node dev compose (docker-compose.yml) with mocked internet topology
- 3-validator prod compose (deploy/prod/) for federation
- Auto-update from Gitea via /api/update-check + systemd timer
- Build-time version injection (ldflags → node --version)
- UI / Swagger toggle flags (DCHAIN_DISABLE_UI, DCHAIN_DISABLE_SWAGGER)

Client (client-app/):
- Expo / React Native / NativeWind
- E2E NaCl encryption, typing indicator, contact requests
- Auto-discovery of canonical contracts, chain_id aware, WS reconnect on node switch

Documentation:
- README.md, CHANGELOG.md, CONTEXT.md
- deploy/single/README.md with 6 operator scenarios
- deploy/UPDATE_STRATEGY.md with 4-layer forward-compat design
- docs/contracts/*.md per contract

client-app/tailwind.config.js

@@ -0,0 +1,28 @@
+/** @type {import('tailwindcss').Config} */
+module.exports = {
+  content: [
+    './app/**/*.{js,jsx,ts,tsx}',
+    './components/**/*.{js,jsx,ts,tsx}',
+    './hooks/**/*.{js,jsx,ts,tsx}',
+    './lib/**/*.{js,jsx,ts,tsx}',
+  ],
+  presets: [require('nativewind/preset')],
+  theme: {
+    extend: {
+      colors: {
+        // DChain brand — deep navy + teal accent
+        background:  '#0d1117',
+        surface:     '#161b22',
+        surfaceHigh: '#21262d',
+        border:      '#30363d',
+        primary:     '#2563eb',
+        primaryFg:   '#ffffff',
+        accent:      '#22d3ee',
+        muted:       '#8b949e',
+        destructive: '#f85149',
+        success:     '#3fb950',
+      },
+    },
+  },
+  plugins: [],
+};