feat: add daily request limit and refactor access control (#759)

- Add daily request limit per IP in blacklist settings (1-1,000,000/day)
- Refactor access control logic: merge blacklist and rate limit checks
- Remove RATE_LIMIT_API_DAILY_REQUESTS env var, use database config instead
- Move x-custom-auth check earlier in middleware chain
- Add comprehensive English documentation (31 new guide pages)
- Improve code structure and error handling

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-authored-by: Claude <noreply@anthropic.com>

vitepress-docs/docs/en/guide/config-send-mail.md

@@ -0,0 +1,84 @@
+
+# Configure Email Sending
+
+::: warning Note
+All three methods can be configured simultaneously. When sending emails, it will prioritize using `resend`, if `resend` is not configured, it will use `smtp`.
+
+If a Cloudflare authenticated forwarding email address is configured, CF's internal API will be prioritized for sending emails
+:::
+
+## Send Emails Using Resend
+
+Register at `https://resend.com/domains` and add DNS records according to the instructions.
+
+Create an `api key` on the `API KEYS` page.
+
+Then execute the following command to add `RESEND_TOKEN` to secrets:
+
+> [!NOTE]
+> If you find this troublesome, you can also put it directly in plain text under `[vars]` in `wrangler.toml`, but this is not recommended
+
+If you deployed through the UI, you can add it under `Variables and Secrets` in the Cloudflare UI interface.
+
+```bash
+# Switch to worker directory
+cd worker
+wrangler secret put RESEND_TOKEN
+```
+
+If you have multiple domains with different `api keys`, you can add multiple secrets in `wrangler.toml`, named `RESEND_TOKEN_` + `<UPPERCASE DOMAIN WITH . REPLACED BY _>`, for example:
+
+```bash
+wrangler secret put RESEND_TOKEN_XXX_COM
+wrangler secret put RESEND_TOKEN_DREAMHUNTER2333_XYZ
+```
+
+## Send Emails Using SMTP
+
+The format of `SMTP_CONFIG` is as follows, where key is the domain name and value is the SMTP configuration. For SMTP configuration format details, refer to [zou-yu/worker-mailer](https://github.com/zou-yu/worker-mailer/blob/main/README_zh-CN.md)
+
+```json
+{
+    "awsl.uk": {
+        "host": "smtp.xxx.com",
+        "port": 465,
+        "secure": true,
+        "authType": [
+            "plain",
+            "login"
+        ],
+        "credentials": {
+            "username": "username",
+            "password": "password"
+        }
+    }
+}
+```
+
+Then execute the following command to add `SMTP_CONFIG` to secrets:
+
+> [!NOTE]
+> If you find this troublesome, you can also put it directly in plain text under `[vars]` in `wrangler.toml`, but this is not recommended
+
+If you deployed through the UI, you can add it under `Variables and Secrets` in the Cloudflare UI interface.
+
+```bash
+# Switch to worker directory
+cd worker
+wrangler secret put SMTP_CONFIG
+```
+
+## Send Emails to Authenticated Forwarding Addresses on Cloudflare
+
+Only supported for CLI deployment, add `send_email` configuration in `wrangler.toml`.
+
+The destination email address must be an authenticated email address on Cloudflare, which has significant limitations. If you need to send emails to other addresses, you can use `resend` or `smtp` to send emails.
+
+```toml
+# Send emails through Cloudflare
+send_email = [
+   { name = "SEND_MAIL" },
+]
+```
+
+Admin console account configuration `Verified address list (can send emails through CF internal API)`