feat: Add DNS provider documentation and enhance provider form with new fields

- Created a comprehensive documentation file for DNS provider types, including RFC 2136, Webhook, and Script providers, detailing their use cases, configurations, and security notes.
- Updated the DNSProviderForm component to handle new field types including select and textarea for better user input management.
- Enhanced the DNS provider schemas to include new fields for script execution, webhook authentication, and RFC 2136 configurations, improving flexibility and usability.

frontend/src/data/dnsProviderSchemas.ts

@@ -216,11 +216,37 @@ export const defaultProviderSchemas: Record<DNSProviderType, Partial<DNSProvider
     name: 'Custom Script',
     fields: [
       {
-        name: 'script_path',
-        label: 'Script Path',
+        name: 'create_script',
+        label: 'Create Record Script',
         type: 'text',
         required: true,
-        hint: 'Path to custom DNS update script',
+        placeholder: '/path/to/create-dns.sh',
+        hint: 'Path to script that creates DNS TXT records. Receives DOMAIN, TOKEN, and FQDN as environment variables.',
+      },
+      {
+        name: 'delete_script',
+        label: 'Delete Record Script',
+        type: 'text',
+        required: false,
+        placeholder: '/path/to/delete-dns.sh',
+        hint: 'Path to script that deletes DNS TXT records. If not set, create script is called with DELETE=true.',
+      },
+      {
+        name: 'shell',
+        label: 'Shell',
+        type: 'text',
+        required: false,
+        default: '/bin/sh',
+        placeholder: '/bin/sh',
+        hint: 'Shell to execute scripts with.',
+      },
+      {
+        name: 'env_vars',
+        label: 'Environment Variables',
+        type: 'textarea',
+        required: false,
+        placeholder: 'API_KEY=secret\nAPI_URL=https://api.example.com',
+        hint: 'Additional environment variables to pass to scripts (one per line, KEY=VALUE format).',
       },
     ],
     documentation_url: '',
@@ -230,10 +256,54 @@ export const defaultProviderSchemas: Record<DNSProviderType, Partial<DNSProvider
     name: 'Webhook',
     fields: [
       {
-        name: 'url',
-        label: 'Webhook URL',
+        name: 'create_url',
+        label: 'Create Record URL',
         type: 'text',
         required: true,
+        placeholder: 'https://api.example.com/dns/create',
+        hint: 'HTTP endpoint to call when creating DNS records. Receives JSON payload with domain, token, and fqdn.',
+      },
+      {
+        name: 'delete_url',
+        label: 'Delete Record URL',
+        type: 'text',
+        required: false,
+        placeholder: 'https://api.example.com/dns/delete',
+        hint: 'HTTP endpoint to call when deleting DNS records. If not set, create URL is called with method DELETE.',
+      },
+      {
+        name: 'auth_type',
+        label: 'Authentication Type',
+        type: 'select',
+        required: false,
+        default: 'none',
+        options: [
+          { value: 'none', label: 'None' },
+          { value: 'bearer', label: 'Bearer Token' },
+          { value: 'basic', label: 'Basic Auth' },
+          { value: 'header', label: 'Custom Header' },
+        ],
+        hint: 'Authentication method for webhook requests.',
+      },
+      {
+        name: 'auth_value',
+        label: 'Auth Value',
+        type: 'password',
+        required: false,
+        placeholder: 'Bearer token, user:pass, or header value',
+        hint: 'Authentication value (token, user:password for basic auth, or header value).',
+      },
+      {
+        name: 'insecure_skip_verify',
+        label: 'Skip TLS Verification',
+        type: 'select',
+        required: false,
+        default: 'false',
+        options: [
+          { value: 'false', label: 'No (Recommended)' },
+          { value: 'true', label: 'Yes (Insecure)' },
+        ],
+        hint: 'Skip TLS certificate verification. Only enable for testing with self-signed certificates.',
       },
     ],
     documentation_url: '',
@@ -243,22 +313,50 @@ export const defaultProviderSchemas: Record<DNSProviderType, Partial<DNSProvider
     name: 'RFC2136 (Dynamic DNS)',
     fields: [
       {
-        name: 'server',
+        name: 'nameserver',
         label: 'DNS Server',
         type: 'text',
         required: true,
+        placeholder: 'ns1.example.com:53',
+        hint: 'DNS server address with port (e.g., ns1.example.com:53).',
       },
       {
-        name: 'key_name',
+        name: 'tsig_key_name',
         label: 'TSIG Key Name',
         type: 'text',
         required: true,
+        placeholder: 'mykey.example.com.',
+        hint: 'TSIG key name (should end with a dot).',
       },
       {
-        name: 'key_secret',
+        name: 'tsig_key_secret',
         label: 'TSIG Key Secret',
         type: 'password',
         required: true,
+        hint: 'Base64-encoded TSIG key secret.',
+      },
+      {
+        name: 'tsig_key_algorithm',
+        label: 'TSIG Algorithm',
+        type: 'select',
+        required: true,
+        default: 'hmac-sha256',
+        options: [
+          { value: 'hmac-md5', label: 'HMAC-MD5 (Legacy)' },
+          { value: 'hmac-sha1', label: 'HMAC-SHA1' },
+          { value: 'hmac-sha256', label: 'HMAC-SHA256 (Recommended)' },
+          { value: 'hmac-sha512', label: 'HMAC-SHA512' },
+        ],
+        hint: 'TSIG authentication algorithm. HMAC-SHA256 is recommended.',
+      },
+      {
+        name: 'dns_timeout',
+        label: 'DNS Timeout',
+        type: 'text',
+        required: false,
+        default: '10s',
+        placeholder: '10s',
+        hint: 'Timeout for DNS operations (e.g., 10s, 30s).',
       },
     ],
     documentation_url: 'https://tools.ietf.org/html/rfc2136',