Add placeholder scaffolding for ui-shared and cashu packages

- ui-shared: Add Vite library config and minimal entry point
- cashu: Add TypeScript config and minimal entry point

These packages are placeholders that will be implemented as needed.
The scaffolding allows the monorepo build to complete.

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

lamassu-next/packages/cashu/src/index.ts

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+/**
+ * @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'

lamassu-next/packages/cashu/tsconfig.json

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+{
+  "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"]
+}

lamassu-next/packages/ui-shared/src/index.ts

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+/**
+ * @lamassu/ui-shared
+ *
+ * Shared Vue 3 components for Lamassu ATM and dashboard.
+ * This package will contain common UI components like:
+ * - QR code display
+ * - Number pad
+ * - Amount display
+ * - Status indicators
+ */
+
+// Placeholder export - components will be added as needed
+export const version = '0.1.0'

lamassu-next/packages/ui-shared/tsconfig.json

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+{
+  "compilerOptions": {
+    "target": "ES2022",
+    "module": "ESNext",
+    "moduleResolution": "bundler",
+    "declaration": true,
+    "declarationMap": true,
+    "sourceMap": true,
+    "outDir": "./dist",
+    "rootDir": "./src",
+    "strict": true,
+    "strictNullChecks": true,
+    "esModuleInterop": true,
+    "skipLibCheck": true,
+    "forceConsistentCasingInFileNames": true,
+    "resolveJsonModule": true,
+    "isolatedModules": true,
+    "jsx": "preserve"
+  },
+  "include": ["src/**/*"],
+  "exclude": ["node_modules", "dist"]
+}

lamassu-next/packages/ui-shared/vite.config.ts

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+import { defineConfig } from 'vite'
+import vue from '@vitejs/plugin-vue'
+import { resolve } from 'path'
+
+export default defineConfig({
+  plugins: [vue()],
+  build: {
+    lib: {
+      entry: resolve(__dirname, 'src/index.ts'),
+      name: 'LamassuUIShared',
+      fileName: 'index',
+    },
+    rollupOptions: {
+      external: ['vue'],
+      output: {
+        globals: {
+          vue: 'Vue',
+        },
+      },
+    },
+  },
+})