feat: email verification via Resend + admin user management

- Add email verification flow: register sends verify link, login blocks unverified accounts, 24h token expiry, resend endpoint (3/h rate limit).
- Add mailer module using Resend with branded HTML + plaintext template.
- Extend admin dashboard: verified-status column, toggle verify/unverify buttons, promote/demote admin role, delete any non-self user.
- Migrate users table: email_verified, verify_token, verify_expires columns.
- Load env via dotenv; add .env to gitignore.

package-lock.json

@@ -12,13 +12,15 @@
         "bcryptjs": "^3.0.3",
         "better-sqlite3": "^12.9.0",
         "cookie-parser": "^1.4.7",
+        "dotenv": "^17.4.2",
         "express": "^5.2.1",
         "express-rate-limit": "^8.3.2",
         "helmet": "^8.1.0",
         "jsonwebtoken": "^9.0.3",
         "multer": "^2.1.1",
         "otplib": "^13.4.0",
-        "qrcode": "^1.5.4"
+        "qrcode": "^1.5.4",
+        "resend": "^6.12.0"
       }
     },
     "node_modules/@noble/hashes": {
@@ -98,6 +100,12 @@
         "url": "https://paulmillr.com/funding/"
       }
     },
+    "node_modules/@stablelib/base64": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/@stablelib/base64/-/base64-1.0.1.tgz",
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+    },
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       "license": "MIT"
     },
+    "node_modules/dotenv": {
+      "version": "17.4.2",
+      "resolved": "https://registry.npmjs.org/dotenv/-/dotenv-17.4.2.tgz",
+      "integrity": "sha512-nI4U3TottKAcAD9LLud4Cb7b2QztQMUEfHbvhTH09bqXTxnSie8WnjPALV/WMCrJZ6UV/qHJ6L03OqO3LcdYZw==",
+      "license": "BSD-2-Clause",
+      "engines": {
+        "node": ">=12"
+      },
+      "funding": {
+        "url": "https://dotenvx.com"
+      }
+    },
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@@ -673,6 +693,12 @@
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+    "node_modules/fast-sha256": {
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+      "resolved": "https://registry.npmjs.org/fast-sha256/-/fast-sha256-1.3.0.tgz",
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+      "license": "Unlicense"
+    },
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@@ -1338,6 +1364,12 @@
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       }
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+    "node_modules/postal-mime": {
+      "version": "2.7.4",
+      "resolved": "https://registry.npmjs.org/postal-mime/-/postal-mime-2.7.4.tgz",
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+      "license": "MIT-0"
+    },
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       "resolved": "https://registry.npmjs.org/prebuild-install/-/prebuild-install-7.1.3.tgz",
@@ -1488,6 +1520,27 @@
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       "license": "ISC"
     },
+    "node_modules/resend": {
+      "version": "6.12.0",
+      "resolved": "https://registry.npmjs.org/resend/-/resend-6.12.0.tgz",
+      "integrity": "sha512-CaxEvX1z+/MGbgnhsM/bvmkbnZd1v1sEXELAjBNSDBQNMaB7MgqOyrBgI27CYikEgdaDnBrXghAXYWTBs/h5Bw==",
+      "license": "MIT",
+      "dependencies": {
+        "postal-mime": "2.7.4",
+        "svix": "1.90.0"
+      },
+      "engines": {
+        "node": ">=20"
+      },
+      "peerDependencies": {
+        "@react-email/render": "*"
+      },
+      "peerDependenciesMeta": {
+        "@react-email/render": {
+          "optional": true
+        }
+      }
+    },
     "node_modules/router": {
       "version": "2.2.0",
       "resolved": "https://registry.npmjs.org/router/-/router-2.2.0.tgz",
@@ -1716,6 +1769,16 @@
         "simple-concat": "^1.0.0"
       }
     },
+    "node_modules/standardwebhooks": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/standardwebhooks/-/standardwebhooks-1.0.0.tgz",
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+      "license": "MIT",
+      "dependencies": {
+        "@stablelib/base64": "^1.0.0",
+        "fast-sha256": "^1.3.0"
+      }
+    },
     "node_modules/statuses": {
       "version": "2.0.2",
       "resolved": "https://registry.npmjs.org/statuses/-/statuses-2.0.2.tgz",
@@ -1777,6 +1840,16 @@
         "node": ">=0.10.0"
       }
     },
+    "node_modules/svix": {
+      "version": "1.90.0",
+      "resolved": "https://registry.npmjs.org/svix/-/svix-1.90.0.tgz",
+      "integrity": "sha512-ljkZuyy2+IBEoESkIpn8sLM+sxJHQcPxlZFxU+nVDhltNfUMisMBzWX/UR8SjEnzoI28ZjCzMbmYAPwSTucoMw==",
+      "license": "MIT",
+      "dependencies": {
+        "standardwebhooks": "1.0.0",
+        "uuid": "^10.0.0"
+      }
+    },
     "node_modules/tar-fs": {
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@@ -1861,6 +1934,19 @@
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       "license": "MIT"
     },
+    "node_modules/uuid": {
+      "version": "10.0.0",
+      "resolved": "https://registry.npmjs.org/uuid/-/uuid-10.0.0.tgz",
+      "integrity": "sha512-8XkAphELsDnEGrDxUOHB3RGvXz6TeuYSGEZBOjtTtPm2lwhGBjLgOzLHB63IUWfBpNucQjND6d3AOudO+H3RWQ==",
+      "funding": [
+        "https://github.com/sponsors/broofa",
+        "https://github.com/sponsors/ctavan"
+      ],
+      "license": "MIT",
+      "bin": {
+        "uuid": "dist/bin/uuid"
+      }
+    },
     "node_modules/vary": {
       "version": "1.1.2",
       "resolved": "https://registry.npmjs.org/vary/-/vary-1.1.2.tgz",