refactor: Cleanup git state - commit all staged changes

Major refactoring cleanup:
- Add new controller architecture (class-controller-*.php)
- Add new settings-v2 UI (views/settings-v2/)
- Add new CSS architecture (agentic-sidebar.css, tokens)
- Add esbuild build pipeline (scripts/build.js, package.json)
- Add composer dependencies (vendor/)
- Add frontend src directory (assets/js/src/index.jsx)
- Add documentation files
- Remove old/obsolete files (class-settings.php, old CSS)

This commits all pending changes from previous refactoring efforts.

vendor/symfony/contracts/composer.json

@@ -0,0 +1,51 @@
+{
+    "name": "symfony/contracts",
+    "type": "library",
+    "description": "A set of abstractions extracted out of the Symfony components",
+    "keywords": ["abstractions", "contracts", "decoupling", "interfaces", "interoperability", "standards", "dev"],
+    "homepage": "https://symfony.com",
+    "license": "MIT",
+    "authors": [
+        {
+            "name": "Nicolas Grekas",
+            "email": "p@tchwork.com"
+        },
+        {
+            "name": "Symfony Community",
+            "homepage": "https://symfony.com/contributors"
+        }
+    ],
+    "require": {
+        "php": ">=8.1",
+        "psr/cache": "^3.0",
+        "psr/container": "^1.1|^2.0",
+        "psr/event-dispatcher": "^1.0"
+    },
+    "require-dev": {
+        "symfony/polyfill-intl-idn": "^1.10"
+    },
+    "conflict": {
+        "ext-psr": "<1.1|>=2"
+    },
+    "replace": {
+        "symfony/cache-contracts": "self.version",
+        "symfony/deprecation-contracts": "self.version",
+        "symfony/event-dispatcher-contracts": "self.version",
+        "symfony/http-client-contracts": "self.version",
+        "symfony/service-contracts": "self.version",
+        "symfony/translation-contracts": "self.version"
+    },
+    "autoload": {
+        "psr-4": { "Symfony\\Contracts\\": "" },
+        "files": [ "Deprecation/function.php" ],
+        "exclude-from-classmap": [
+            "**/Tests/"
+        ]
+    },
+    "minimum-stability": "dev",
+    "extra": {
+        "branch-alias": {
+            "dev-main": "3.7-dev"
+        }
+    }
+}