chore(init): scaffold Gitea mail templates — 110 templates, 10 visual styles, drop-in deployment

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

themes/horizon/mail/user/auth/activate_email.tmpl

@@ -0,0 +1,67 @@
+<!DOCTYPE html>
+<html>
+<head>
+  <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
+  <meta name="viewport" content="width=device-width, initial-scale=1.0">
+  <title>{{.locale.Tr "mail.activate_email.title" (.DisplayName|DotEscape)}}</title>
+  <style type="text/css">
+    .ExternalClass, .ReadMsgBody { width: 100%; background-color: #f4f6f9; }
+  </style>
+</head>
+<body style="margin:0; padding:0; background-color:#f4f6f9; font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif; -webkit-text-size-adjust:100%; -ms-text-size-adjust:100%;">
+
+  <center style="width:100%; table-layout:fixed;">
+    <div style="max-width:600px; margin:20px auto; background:#ffffff; border-radius:12px; box-shadow:0 4px 12px rgba(0,0,0,0.05); overflow:hidden;">
+
+      <div style="padding:28px 32px 16px; border-bottom:1px solid #eef2f6;">
+        <table width="100%" cellpadding="0" cellspacing="0" border="0" style="border-collapse:collapse;">
+          <tr>
+            <td style="vertical-align:middle;">
+              <img src="{{AppUrl}}assets/img/favicon.png" alt="logo" width="32" height="32" style="display:inline-block; vertical-align:middle; margin-right:12px; border:0; outline:none;">
+              <span style="font-size:22px; font-weight:600; color:#1e293b; letter-spacing:-0.2px; vertical-align:middle;">{{AppName}}</span>
+            </td>
+          </tr>
+        </table>
+      </div>
+
+      <div style="padding:32px 32px 24px; color:#334155;">
+        <p style="margin:0 0 16px; font-size:16px; line-height:1.5; color:#1e293b;">
+          {{.locale.Tr "mail.hi_user_x" (.DisplayName|DotEscape)}}
+        </p>
+        <p style="margin:0 0 20px; font-size:16px; line-height:1.5; color:#334155;">
+          {{.locale.Tr "mail.activate_email.text" .ActiveCodeLives}}
+        </p>
+
+        {{$activate_url := printf "%suser/activate_email?code=%s&email=%s" AppUrl (QueryEscape .Code) (QueryEscape .Email)}}
+        <table border="0" cellpadding="0" cellspacing="0" width="100%" style="margin:28px 0 24px; border-collapse:separate;">
+          <tr>
+            <td align="center" style="border-radius:48px; background-color:#1e88e5;" bgcolor="#1e88e5">
+              <a href="{{$activate_url}}" style="display:inline-block; padding:14px 36px; font-size:16px; font-weight:500; color:#ffffff; text-decoration:none; background-color:#1e88e5; border-radius:48px; border:1px solid #1e88e5; letter-spacing:0.3px; text-align:center;">Verify Email Address</a>
+            </td>
+          </tr>
+        </table>
+
+        <div style="background:#f8fafc; border:1px solid #e2e8f0; border-radius:10px; padding:16px 18px; margin:24px 0 16px; word-break:break-word;">
+          <p style="margin:0 0 8px; font-size:14px; color:#475569; line-height:1.5;">
+            {{.locale.Tr "mail.link_not_working_do_paste"}}
+          </p>
+          <p style="margin:0; font-size:14px; font-family:monospace; color:#1e88e5; background:#ffffff; padding:10px 12px; border-radius:6px; border:1px solid #e2e8f0; word-break:break-all;">
+            {{$activate_url}}
+          </p>
+        </div>
+        <div style="height:1px; background:linear-gradient(90deg, transparent, #e2e8f0, transparent); margin:16px 0 8px;"></div>
+      </div>
+
+      <div style="padding:20px 32px 28px; background:#f9fbfd; border-top:1px solid #eef2f6; text-align:left;">
+        <p style="margin:0; font-size:14px; color:#64748b;">
+          © <a href="{{AppUrl}}" target="_blank" rel="noopener noreferrer" style="color:#1e88e5; text-decoration:none; font-weight:500; border-bottom:1px dotted #b9d5f0;">{{AppName}}</a>
+        </p>
+        <p style="margin:6px 0 0; font-size:12px; color:#94a3b8;">Secure email verification – if you didn’t request this, please ignore this email.</p>
+      </div>
+
+    </div>
+  </center>
+
+  <div style="display:none; white-space:nowrap; font-size:0; line-height:0;"> </div>
+</body>
+</html>