fix: restore root-level PHP dirs for Kimai PSR-4 autoloading

Kimai's autoloader maps KimaiPlugin\ => var/plugins/, so plugin classes
must live at the bundle root, not under src/.

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

composer.json

@@ -3,6 +3,17 @@
     "type": "kimai-plugin",
     "description": "GitHub-style activity heatmap dashboard widget for Kimai",
     "license": "MIT",
+    "keywords": ["kimai", "plugin", "heatmap", "dashboard", "time-tracking"],
+    "homepage": "https://git.toph.so/toph/kimai-plugin-heatmap",
+    "authors": [
+        {
+            "name": "Christopher Mühl",
+            "homepage": "https://toph.so"
+        }
+    ],
+    "require": {
+        "php": ">=8.2"
+    },
     "autoload": {
         "psr-4": {
             "KimaiPlugin\\KimaiHeatmapBundle\\": ""