feat(scheduled-ops): add scheduled operations for Team Pro users (#231)

Adds the ability to schedule recurring Docker operations (stack restarts,
fleet snapshots, system prunes) via cron expressions with full execution
history logging. Includes Run Now for on-demand execution.

frontend/package-lock.json

@@ -33,6 +33,7 @@
         "class-variance-authority": "^0.7.1",
         "clsx": "^2.1.1",
         "cmdk": "^1.1.1",
+        "cronstrue": "^3.14.0",
         "geist": "^1.7.0",
         "lucide-react": "^1.6.0",
         "monaco-editor": "^0.55.1",
@@ -3660,6 +3661,15 @@
       "dev": true,
       "license": "MIT"
     },
+    "node_modules/cronstrue": {
+      "version": "3.14.0",
+      "resolved": "https://registry.npmjs.org/cronstrue/-/cronstrue-3.14.0.tgz",
+      "integrity": "sha512-XnW4vuK/jPJjmTyDWiej1Zq36Od7ITwxaV2O1pzHZuyMVvdy7NAvyvIBzybt+idqSpfqYuoDG7uf/ocGtJVWxA==",
+      "license": "MIT",
+      "bin": {
+        "cronstrue": "bin/cli.js"
+      }
+    },
     "node_modules/cross-spawn": {
       "version": "7.0.6",
       "resolved": "https://registry.npmjs.org/cross-spawn/-/cross-spawn-7.0.6.tgz",