feat(frontend): upgrade report dialog experience

Replace manual report links with automatic target association, improve validation and evidence uploads, and remove retired report UI code.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

templates/parts/user/author-hero.php

@@ -107,12 +107,10 @@ $show_cover_menu = $has_more_details || $show_cover_report || $cover_ban_html !=
 				<?php if ($has_more_details) : ?><button type="button" role="menuitem" data-aksrt-profile-details><i class="fa fas fa-address-card" aria-hidden="true"></i><?php esc_html_e('更多资料', 'aksrt'); ?></button><?php endif; ?>
 				<?php if ($show_cover_report) : ?>
 					<?php
-					// 统一举报契约：report.js 弹窗展示被举报对象（头像 + 名称）。
 					$report_payload = [
-						'target_type'   => 'user',
-						'target_id'     => $user_id,
-						'target_name'   => $user->display_name,
-						'target_avatar' => get_avatar_url($user_id, ['size' => 40]),
+						'target_type' => 'user',
+						'target_id'   => $user_id,
+						'target_name' => $user->display_name,
 					];
 					?>
 					<?php if (is_user_logged_in()) : ?><button type="button" role="menuitem" data-aksrt-report="<?php echo esc_attr(wp_json_encode($report_payload)); ?>"><i class="fa fas fa-flag" aria-hidden="true"></i><?php esc_html_e('举报用户', 'aksrt'); ?></button>