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/jawira/plantuml/bin/plantuml

@@ -0,0 +1,11 @@
+#!/usr/bin/env bash
+
+#see http://stackoverflow.com/questions/7665/how-to-resolve-symbolic-links-in-a-shell-script
+SELF_PATH=$(cd -P -- "$(dirname -- "$0")" && pwd -P) && SELF_PATH=$SELF_PATH/$(basename -- "$0")
+while [ -h "$SELF_PATH" ]; do
+    DIR=$(dirname -- "$SELF_PATH")
+    SYM=$(readlink "$SELF_PATH")
+    SELF_PATH=$(cd "$DIR" && cd $(dirname -- "$SYM") && pwd)/$(basename -- "$SYM")
+done
+
+exec java -jar "${SELF_PATH}.jar" -charset UTF-8 "$@"

vendor/jawira/plantuml/bin/plantuml.jar.md5

@@ -0,0 +1 @@
+d01215802b2af99931813cf3b943d957  plantuml.jar

vendor/jawira/plantuml/bin/plantuml.jar.sha1

@@ -0,0 +1 @@
+f1053336943799f3a62c68a208eeaf52100acbf4  plantuml.jar