feat: Stripe integration — checkout + webhook + subscription lifecycle

- src/lib/stripe/index.ts: Stripe client (checkout session + webhook event)
- POST /api/aos/stripe/checkout: create subscription checkout for a license
- POST /api/aos/stripe/webhook: handle events:
  - checkout.session.completed → link Stripe customer/subscription to license
  - invoice.paid → activate license (remove trial)
  - customer.subscription.deleted → cancel license + schedule instance deletion
  - invoice.payment_failed → suspend license (dunning)
- Middleware: stripe/webhook is public (Stripe calls it without auth)
- stripe package installed (v23)

bun.lock

@@ -68,6 +68,7 @@
         "recharts": "^2.15.4",
         "sharp": "^0.34.3",
         "sonner": "^2.0.6",
+        "stripe": "^23.0.1",
         "tailwind-merge": "^3.7.0",
         "tailwindcss-animate": "^1.0.7",
         "uuid": "^11.1.0",
@@ -1756,6 +1757,8 @@
 
     "strip-json-comments": ["strip-json-comments@3.1.1", "https://registry.npmjs.com/strip-json-comments/-/strip-json-comments-3.1.1.tgz", {}, "sha512-6fPc+R4ihwqP6N/aIv2f1gMH8lOVtWQHoqC4yK6oSDVVocumAsfCqjkXnqiYMhmMwS/mEHLp7Vehlt3ql6lEig=="],
 
+    "stripe": ["stripe@23.0.1", "", { "peerDependencies": { "@types/node": ">=20" }, "optionalPeers": ["@types/node"] }, "sha512-VFLs9IAzSZ8GIm6/vqhjqOL0fbYrSNYCpgZ3LS3YkSi/i5RnyMpu/Hf9YxPTOCYwc3mZKU3IJvuvKffQH2NLMg=="],
+
     "style-mod": ["style-mod@4.1.3", "https://registry.npmjs.com/style-mod/-/style-mod-4.1.3.tgz", {}, "sha512-i/n8VsZydrugj3Iuzll8+x/00GH2vnYsk1eomD8QiRrSAeW6ItbCQDtfXCeJHd0iwiNagqjQkvpvREEPtW3IoQ=="],
 
     "style-to-js": ["style-to-js@1.1.21", "https://registry.npmjs.com/style-to-js/-/style-to-js-1.1.21.tgz", { "dependencies": { "style-to-object": "1.0.14" } }, "sha512-RjQetxJrrUJLQPHbLku6U/ocGtzyjbJMP9lCNK7Ag0CNh690nSH8woqWH9u16nMjYBAok+i7JO1NP2pOy8IsPQ=="],