Deploy 868d31c from main

includes/class-psa-config.php

@@ -0,0 +1,48 @@
+<?php
+/**
+ * Configuration constants for Peptide Search AI.
+ *
+ * What: Centralizes all magic numbers and configuration values used across the plugin.
+ * Who calls it: Every class in the plugin reads these constants for limits, timeouts, and defaults.
+ * Dependencies: None (pure constants class).
+ *
+ * @package PeptideSearchAI
+ */
+declare( strict_types=1 );
+
+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;
+
+	// Daily generation cap
+	const DAILY_GENERATION_CAP   = 50;
+
+	// 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
+
+	// Cost tracking and budget
+	const DEFAULT_MONTHLY_BUDGET = 0; // 0 = unlimited
+}