feat: email integration (nodemailer) + wire into agency/license flows

- src/lib/email.ts: SMTP client with pre-built templates:
  - sendAgencyApprovedEmail (reseller approval + discount)
  - sendAgencyRejectedEmail (reseller rejection + reason)
  - sendLicenseKeyEmail (license key delivery)
  - sendTicketCreatedEmail (ticket confirmation)
- Agency approve route: sends approval email after DB update
- Agency reject route: sends rejection email with reason
- License creation route: sends license key email (fire-and-forget)
- Graceful degradation: if SMTP not configured, logs warning + continues
- nodemailer + @types/nodemailer installed

bun.lock

@@ -43,6 +43,7 @@
         "@reactuses/core": "^6.0.5",
         "@tanstack/react-query": "^5.82.0",
         "@tanstack/react-table": "^8.21.3",
+        "@types/nodemailer": "^8.0.2",
         "class-variance-authority": "^0.7.1",
         "clsx": "^2.1.1",
         "cmdk": "^1.1.1",
@@ -57,6 +58,7 @@
         "next-auth": "^4.24.11",
         "next-intl": "^4.3.4",
         "next-themes": "^0.4.6",
+        "nodemailer": "^10.2.1",
         "prisma": "^6.11.1",
         "react": "^19.0.0",
         "react-day-picker": "^9.8.0",
@@ -721,6 +723,8 @@
 
     "@types/node": ["@types/node@25.0.9", "https://registry.npmjs.com/@types/node/-/node-25.0.9.tgz", { "dependencies": { "undici-types": "~7.16.0" } }, "sha512-/rpCXHlCWeqClNBwUhDcusJxXYDjZTyE8v5oTO7WbL8eij2nKhUeU89/6xgjU7N4/Vh3He0BtyhJdQbDyhiXAw=="],
 
+    "@types/nodemailer": ["@types/nodemailer@8.0.2", "", { "dependencies": { "@types/node": "*" } }, "sha512-c7M5ox8p0nEOfbJ2E9Qcmt8/QCu/VzsiAhzBiZbvky2PhKZDHpKB3sQHBM5MEZNkCfBOaS6S9//AGPRTNB7IaA=="],
+
     "@types/react": ["@types/react@19.2.8", "https://registry.npmjs.com/@types/react/-/react-19.2.8.tgz", { "dependencies": { "csstype": "^3.2.2" } }, "sha512-3MbSL37jEchWZz2p2mjntRZtPt837ij10ApxKfgmXCTuHWagYg7iA5bqPw6C8BMPfwidlvfPI/fxOc42HLhcyg=="],
 
     "@types/react-dom": ["@types/react-dom@19.2.3", "https://registry.npmjs.com/@types/react-dom/-/react-dom-19.2.3.tgz", { "peerDependencies": { "@types/react": "^19.2.0" } }, "sha512-jp2L/eY6fn+KgVVQAOqYItbF0VY/YApe5Mz2F0aykSO8gx31bYCZyvSeYxCHKvzHG5eZjc+zyaS5BrBWya2+kQ=="],
@@ -1521,6 +1525,8 @@
 
     "node-releases": ["node-releases@2.0.27", "https://registry.npmjs.com/node-releases/-/node-releases-2.0.27.tgz", {}, "sha512-nmh3lCkYZ3grZvqcCH+fjmQ7X+H0OeZgP40OierEaAptX4XofMh5kwNbWh7lBduUzCcV/8kZ+NDLCwm2iorIlA=="],
 
+    "nodemailer": ["nodemailer@10.2.1", "", {}, "sha512-ZrDNsPFoDMwefNs7sJwrYiEJ/CG4ClJWDZv05iNJsEBWa8GRDry1QJHTJxsuTAY9eDDKjX4k+q3SxslXJOao7w=="],
+
     "nypm": ["nypm@0.6.2", "https://registry.npmjs.com/nypm/-/nypm-0.6.2.tgz", { "dependencies": { "citty": "^0.1.6", "consola": "^3.4.2", "pathe": "^2.0.3", "pkg-types": "^2.3.0", "tinyexec": "^1.0.1" }, "bin": { "nypm": "dist/cli.mjs" } }, "sha512-7eM+hpOtrKrBDCh7Ypu2lJ9Z7PNZBdi/8AT3AX8xoCj43BBVHD0hPSTEvMtkMpfs8FCqBGhxB+uToIQimA111g=="],
 
     "oauth": ["oauth@0.9.15", "https://registry.npmjs.com/oauth/-/oauth-0.9.15.tgz", {}, "sha512-a5ERWK1kh38ExDEfoO6qUHJb32rd7aYmPHuyCu3Fta/cnICvYmgd2uhuKXvPD+PXB+gCEYYEaQdIRAjCOwAKNA=="],