fix: correct class-psa-search.php blob (was truncated in chunked upload)

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

includes/class-psa-config.php

@@ -0,0 +1,39 @@
+<?php
+/**
+ * Configuration constants for Peptide Search AI.
+ * Centralizes all magic numbers and configuration values.
+ *
+ * @package PeptideSearchAI
+ */
+
+if ( ! defined( 'ABSPATH' ) ) {
+	exit;
+}
+
+class PSA_Config {
+
+	// Search query validation
+	const MIN_QUERY_LENGTH = 2;
+	const MAX_QUERY_LENGTH = 100;
+
+	// Rate limiting (requests per hour)
+	const REST_RATE_LIMIT = 20;
+	const AJAX_RATE_LIMIT = 10;
+
+	// Generation timing
+	const PENDING_TIMEOUT = 300; // seconds (5 minutes)
+	const MAX_GENERATION_RETRIES = 3;
+
+	// AI token limits
+	const VALIDATION_MAX_TOKENS = 300;
+	const GENERATION_MAX_TOKENS = 4096;
+
+	// Cache TTL
+	const VALIDATION_CACHE_TTL = null; // Set to DAY_IN_SECONDS at runtime
+	const PUBCHEM_CACHE_TTL = null; // Set to 7 * DAY_IN_SECONDS at runtime
+
+	// API retry settings
+	const API_RETRY_MAX = 3;
+	const API_RETRY_BASE_DELAY = 5; // seconds
+
+}