additional fetaure buildout for footer and footer links

backend/internal/notifications/email.go

@@ -5,6 +5,8 @@ import (
 	"context"
 	"encoding/json"
 	"fmt"
+	"html"
+	"io"
 	"log"
 	"net/http"
 	"time"
@@ -156,3 +158,57 @@ func alertTypeLabel(alertType string) string {
 		return "Alert"
 	}
 }
+
+type resendSupportPayload struct {
+	From    string `json:"from"`
+	To      string `json:"to"`
+	Subject string `json:"subject"`
+	Text    string `json:"text"`
+	HTML    string `json:"html"`
+}
+
+// SendSupportEmail delivers a plain-text support request via Resend (HTML copy is escaped).
+func SendSupportEmail(apiKey, fromAddress, toAddress, subject, plainBody string) error {
+	if apiKey == "" {
+		return fmt.Errorf("RESEND_API_KEY not set") //nolint:err113
+	}
+
+	escaped := html.EscapeString(plainBody)
+	htmlBody := `<pre style="font-family:ui-sans-serif,system-ui,sans-serif;white-space:pre-wrap;">` +
+		escaped + `</pre>`
+
+	payload := resendSupportPayload{
+		From:    fromAddress,
+		To:      toAddress,
+		Subject: subject,
+		Text:    plainBody,
+		HTML:    htmlBody,
+	}
+
+	body, err := json.Marshal(payload)
+	if err != nil {
+		return fmt.Errorf("marshal support email payload: %w", err)
+	}
+
+	req, err := http.NewRequest(http.MethodPost, "https://api.resend.com/emails", bytes.NewReader(body))
+	if err != nil {
+		return fmt.Errorf("create support email request: %w", err)
+	}
+	req.Header.Set("Content-Type", "application/json")
+	req.Header.Set("Authorization", "Bearer "+apiKey)
+
+	resp, err := emailHTTPClient.Do(req)
+	if err != nil {
+		log.Printf("Failed to send support email: %v", err)
+		return err
+	}
+	defer resp.Body.Close()
+
+	if resp.StatusCode < 200 || resp.StatusCode >= 300 {
+		snippet, _ := io.ReadAll(io.LimitReader(resp.Body, 2048))
+		log.Printf("Resend support email failed: HTTP %d body: %s", resp.StatusCode, string(snippet))
+		return fmt.Errorf("resend API failed: HTTP %d: %s", resp.StatusCode, string(snippet)) //nolint:err113
+	}
+
+	return nil
+}