feat(docker): add dev.sh with auto-funding and ATM app setup

- Add dev.sh script for managing regtest development environment
- Implement cmd_fund to fund ATM app owner via Lightning.Pub API
- Add --fund flag to cmd_up for automatic funding on startup
- Update setup_atm_app to write VITE_APP_ID to machine .env
- Fix Electron IPC to pass appId and extensionApiUrl to renderer
- Restructure repo from nested lamassu-next/ to root

The dev.sh script now supports:
- ./dev.sh up --fund  # Start regtest and auto-fund ATM
- ./dev.sh fund       # Fund existing ATM app
- ./dev.sh status     # Show environment status
- ./dev.sh reset      # Clean restart

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

apps/machine/.env.example

@@ -0,0 +1,49 @@
+# Lamassu ATM Configuration
+# Copy this file to .env and fill in your values
+
+# =============================================================================
+# Hardware Configuration
+# =============================================================================
+
+# Machine model preset (sintra, gaia, or custom)
+VITE_LAMASSU_MACHINE_MODEL=sintra
+
+# Fiat currency code (ISO 4217)
+VITE_LAMASSU_FIAT_CODE=USD
+
+# Custom device paths (optional - uses preset defaults if not set)
+# VITE_LAMASSU_VALIDATOR_DEVICE=/dev/ttyJ5
+# VITE_LAMASSU_DISPENSER_DEVICE=/dev/ttyJ7
+
+# Cassette configuration (optional - JSON array)
+# VITE_LAMASSU_CASSETTES='[{"denomination":20,"count":100}]'
+
+# =============================================================================
+# Lightning.Pub Connection (Required)
+# =============================================================================
+
+# Nostr relay WebSocket URL
+VITE_RELAY_URL=ws://localhost:7777
+
+# Lightning.Pub's Nostr public key (required!)
+# Get from: docker logs lamassu-lightning-pub | grep pubkey
+VITE_LIGHTNING_PUB_PUBKEY=
+
+# Lightning.Pub HTTP API URL (optional)
+VITE_LIGHTNING_PUB_API_URL=http://localhost:1776
+
+# =============================================================================
+# ATM Identity
+# =============================================================================
+
+# ATM's Nostr private key (hex format, 64 characters)
+# Generate with: npx @lamassu/nostr-client generate-keypair
+# If not set, generates ephemeral identity on each restart
+VITE_ATM_PRIVATE_KEY=
+
+# =============================================================================
+# Development Only
+# =============================================================================
+
+# Lightning.Pub admin token (dev/testing only)
+VITE_ADMIN_TOKEN=lamassu-dev-admin-token