fix(templates): cross-validate against official Gitea mail templates

- Fix INK theme: replace .ActiveCodeLives with correct field, remove from non-auth contexts (8 files)
- Fix hardcoded button text: use locale key mail.view_it_on in ember, heritage, ink, mono, terminal, terra (30+ files)
- Add missing {{if .CanReply}}mail.reply{{end}} block to all 10 themes default.tmpl
- Add missing mail.release.note locale label to all 10 themes release.tmpl
- Add missing mail.team_invite.text_3 to ink and terra team_invite.tmpl
- Add missing blockquote CSS to aurora, ink, mono, neon, terra default.tmpl

Verified: all 110 templates compile successfully with Go build-preview.

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

themes/terra/mail/org/team_invite.tmpl

@@ -32,7 +32,7 @@
       <tr><td class="resp-pad" style="padding:16px 32px 24px;color:#5c4030;">
         <p style="margin:0 0 8px;font-size:15px;line-height:1.8;color:#6b5040;">{{.locale.Tr "mail.team_invite.text_1" (DotEscape .Inviter.DisplayName) (DotEscape .Team.Name) (DotEscape .Organization.DisplayName)}}</p>
         <p style="margin:0 0 24px;font-size:14px;line-height:1.8;color:#8c7a6e;font-style:italic;">{{.locale.Tr "mail.team_invite.text_2"}}</p>
-        
+
         <table border="0" cellpadding="0" cellspacing="0" width="100%" style="margin:0 0 28px;"><tr><td>
           <a href="{{.InviteURL}}" class="resp-btn" style="display:inline-block;padding:14px 38px;font-size:15px;font-weight:600;color:#fff;text-decoration:none;background:#c67b5c;border-radius:24px;letter-spacing:0.3px;">Activate Your Account</a>
         </td></tr></table>
@@ -40,6 +40,7 @@
           <p style="margin:0 0 6px;font-size:12px;color:#8c7a6e;font-style:italic;">{{.locale.Tr "mail.link_not_working_do_paste"}}</p>
           <p style="margin:0;font-size:12px;font-family:monospace;color:#5c4030;background:#fffdf9;padding:10px 12px;border:1px solid #d4c4a8;border-radius:6px;word-break:break-all;">{{.InviteURL}}</p>
         </td></tr></table>
+        <p style="margin:12px 0 0;font-size:13px;line-height:1.6;color:#6b5040;">{{.locale.Tr "mail.team_invite.text_3" .Invite.Email}}</p>
       </td></tr>
       <!-- footer -->
       <tr><td style="padding:20px 32px;border-top:1px solid #d4c4a8;background:#f5ede0;text-align:center;">