perf: improve rate limiting resilience and reduce cache invalidation overhead

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

composer.json

@@ -1,36 +0,0 @@
-{
-    "name": "peptiderepo/peptide-search-ai",
-    "description": "Searchable peptide database with AI-powered auto-population for WordPress",
-    "type": "wordpress-plugin",
-    "license": "GPL-2.0-or-later",
-    "authors": [
-        {
-            "name": "Terence",
-            "role": "Lead Developer"
-        }
-    ],
-    "require": {
-        "php": ">=7.4"
-    },
-    "require-dev": {
-        "phpunit/phpunit": "^9.0 || ^10.0",
-        "squizlabs/php_codesniffer": "^3.7",
-        "wp-coding-standards/wpcs": "^3.0",
-        "dealerdirect/phpcodesniffer-composer-installer": "^1.0"
-    },
-    "autoload": {
-        "psr-4": {
-            "PSA\\": "includes/"
-        }
-    },
-    "config": {
-        "allow-plugins": {
-            "dealerdirect/phpcodesniffer-composer-installer": true
-        }
-    },
-    "scripts": {
-        "test": "phpunit",
-        "lint": "phpcs",
-        "lint:fix": "phpcbf"
-    }
-}