perf: improve rate limiting resilience and reduce cache invalidation overhead

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

uninstall.php

@@ -1,39 +0,0 @@
-<?php
-/**
- * Fired when the plugin is uninstalled.
- *
- * Cleans up all plugin data: peptide posts, post meta, options, transients, and rewrite rules.
- *
- * @package PeptideSearchAI
- */
-
-// Abort if not called by WordPress.
-if ( ! defined( 'WP_UNINSTALL_PLUGIN' ) ) {
-	exit;
-}
-
-global $wpdb;
-
-// 1. Delete all peptide custom posts and their meta.
-$peptide_ids = $wpdb->get_col(
-	"SELECT ID FROM {$wpdb->posts} WHERE post_type = 'peptide'"
-);
-
-if ( ! empty( $peptide_ids ) ) {
-	foreach ( $peptide_ids as $post_id ) {
-		wp_delete_post( (int) $post_id, true ); // Force delete, bypass trash.
-	}
-}
-
-// 2. Delete plugin options.
-delete_option( 'psa_settings' );
-
-// 3. Delete all plugin transients (validation cache, rate limits).
-$wpdb->query(
-	"DELETE FROM {$wpdb->options}
-	 WHERE option_name LIKE '_transient_psa_%'
-	    OR option_name LIKE '_transient_timeout_psa_%'"
-);
-
-// 4. Flush rewrite rules to clean up the peptide post type permalinks.
-flush_rewrite_rules();