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.

node_modules/esbuild/package.json

@@ -0,0 +1,46 @@
+{
+  "name": "esbuild",
+  "version": "0.20.2",
+  "description": "An extremely fast JavaScript and CSS bundler and minifier.",
+  "repository": {
+    "type": "git",
+    "url": "git+https://github.com/evanw/esbuild.git"
+  },
+  "scripts": {
+    "postinstall": "node install.js"
+  },
+  "main": "lib/main.js",
+  "types": "lib/main.d.ts",
+  "engines": {
+    "node": ">=12"
+  },
+  "bin": {
+    "esbuild": "bin/esbuild"
+  },
+  "optionalDependencies": {
+    "@esbuild/aix-ppc64": "0.20.2",
+    "@esbuild/android-arm": "0.20.2",
+    "@esbuild/android-arm64": "0.20.2",
+    "@esbuild/android-x64": "0.20.2",
+    "@esbuild/darwin-arm64": "0.20.2",
+    "@esbuild/darwin-x64": "0.20.2",
+    "@esbuild/freebsd-arm64": "0.20.2",
+    "@esbuild/freebsd-x64": "0.20.2",
+    "@esbuild/linux-arm": "0.20.2",
+    "@esbuild/linux-arm64": "0.20.2",
+    "@esbuild/linux-ia32": "0.20.2",
+    "@esbuild/linux-loong64": "0.20.2",
+    "@esbuild/linux-mips64el": "0.20.2",
+    "@esbuild/linux-ppc64": "0.20.2",
+    "@esbuild/linux-riscv64": "0.20.2",
+    "@esbuild/linux-s390x": "0.20.2",
+    "@esbuild/linux-x64": "0.20.2",
+    "@esbuild/netbsd-x64": "0.20.2",
+    "@esbuild/openbsd-x64": "0.20.2",
+    "@esbuild/sunos-x64": "0.20.2",
+    "@esbuild/win32-arm64": "0.20.2",
+    "@esbuild/win32-ia32": "0.20.2",
+    "@esbuild/win32-x64": "0.20.2"
+  },
+  "license": "MIT"
+}