fix(machine): seed cassettes on first boot + add atm-transactions script

Cassette inventory was never initialized in SQLite, so
recordTransaction's UPDATE decrements were no-ops against an empty
table. Now the Electron main process seeds cassettes from
VITE_LAMASSU_CASSETTES or the model preset on first boot.

Also adds an atm-transactions CLI script (with --summary, --inventory,
--type, --today, --last, --since filters) and sqlite to the NixOS
system packages.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

apps/machine/electron/main.ts

@@ -230,6 +230,50 @@ ipcMain.handle('hal:cleanup', async () => {
 // App lifecycle
 app.whenReady().then(() => {
   initDatabase()
+
+  // Seed cassettes from env/preset if DB table is empty.
+  // This ensures recordTransaction() can decrement cassette counts
+  // even before the operator explicitly sets them via the UI.
+  const existing = loadCassettes()
+  if (existing.length === 0) {
+    let seedCassettes: { denomination: number; count: number }[] = []
+
+    // Priority 1: explicit VITE_LAMASSU_CASSETTES env var
+    const cassettesJson = process.env.VITE_LAMASSU_CASSETTES
+    if (cassettesJson) {
+      try {
+        seedCassettes = JSON.parse(cassettesJson)
+      } catch (e) {
+        console.warn('[Electron] Failed to parse VITE_LAMASSU_CASSETTES:', e)
+      }
+    }
+
+    // Priority 2: default presets per model
+    if (seedCassettes.length === 0) {
+      const model = process.env.VITE_LAMASSU_MACHINE_MODEL || 'sintra'
+      const presets: Record<string, { denomination: number; count: number }[]> = {
+        douro: [
+          { denomination: 100, count: 50 },
+          { denomination: 200, count: 50 },
+        ],
+        sintra: [{ denomination: 20, count: 50 }],
+        tejo: [
+          { denomination: 5, count: 500 },
+          { denomination: 20, count: 500 },
+          { denomination: 50, count: 500 },
+          { denomination: 100, count: 500 },
+        ],
+        gaia: [{ denomination: 20, count: 50 }],
+      }
+      seedCassettes = presets[model] || []
+    }
+
+    if (seedCassettes.length > 0) {
+      setCassettes(seedCassettes)
+      console.log('[Electron] Seeded cassettes from config:', seedCassettes)
+    }
+  }
+
   createWindow()
 
   app.on('activate', () => {