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>

packages/cashu/package.json

@@ -0,0 +1,30 @@
+{
+  "name": "@lamassu/cashu",
+  "version": "0.1.0",
+  "description": "Cashu ecash integration for offline ATM operation",
+  "type": "module",
+  "main": "./dist/index.js",
+  "types": "./dist/index.d.ts",
+  "exports": {
+    ".": {
+      "types": "./dist/index.d.ts",
+      "import": "./dist/index.js"
+    }
+  },
+  "scripts": {
+    "build": "tsc",
+    "dev": "tsc --watch",
+    "test": "vitest run",
+    "test:watch": "vitest",
+    "typecheck": "tsc --noEmit",
+    "lint": "eslint src/"
+  },
+  "dependencies": {
+    "@cashu/cashu-ts": "^2.0.0"
+  },
+  "devDependencies": {
+    "@types/node": "^22.0.0",
+    "typescript": "^5.7.0",
+    "vitest": "^2.1.0"
+  }
+}

packages/cashu/src/__tests__/index.test.ts

@@ -0,0 +1,17 @@
+import { describe, it, expect } from 'vitest'
+import { version } from '../index.js'
+
+describe('@lamassu/cashu', () => {
+  describe('exports', () => {
+    it('should export version', () => {
+      expect(version).toBe('0.1.0')
+    })
+  })
+
+  // TODO: Add tests when cashu functionality is implemented
+  describe('placeholder', () => {
+    it('should pass placeholder test', () => {
+      expect(true).toBe(true)
+    })
+  })
+})

packages/cashu/src/index.ts

@@ -0,0 +1,21 @@
+/**
+ * @lamassu/cashu
+ *
+ * Cashu ecash integration for offline ATM operation.
+ *
+ * Cashu provides:
+ * - Offline payment acceptance (ecash tokens)
+ * - Privacy-preserving transactions
+ * - Fallback when Lightning is unavailable
+ *
+ * This package will implement:
+ * - Token minting and verification
+ * - Token redemption
+ * - Mint management
+ */
+
+// Placeholder export - implementation will be added as needed
+export const version = '0.1.0'
+
+// Re-export cashu-ts types for convenience when implemented
+// export * from '@cashu/cashu-ts'

packages/cashu/tsconfig.json

@@ -0,0 +1,22 @@
+{
+  "compilerOptions": {
+    "target": "ES2022",
+    "module": "NodeNext",
+    "moduleResolution": "NodeNext",
+    "declaration": true,
+    "declarationMap": true,
+    "sourceMap": true,
+    "outDir": "./dist",
+    "rootDir": "./src",
+    "strict": true,
+    "strictNullChecks": true,
+    "noUncheckedIndexedAccess": true,
+    "esModuleInterop": true,
+    "skipLibCheck": true,
+    "forceConsistentCasingInFileNames": true,
+    "resolveJsonModule": true,
+    "isolatedModules": true
+  },
+  "include": ["src/**/*"],
+  "exclude": ["node_modules", "dist", "**/*.test.ts"]
+}