paintplus: vendor the app source and rename from EditmaskwithAI

Bring the full EditmaskwithAI application into the repo under paintplus/
(429 files) so the service is self-contained — the installer copies the
vendored source to ~/docker/paintplus/src instead of cloning at runtime.

Rename to PaintPlus (service + branding; app logic untouched):
- services/editmaskwithai.sh -> services/paintplus.sh (register_service
  paintplus, install_paintplus, ~/docker/paintplus, Caddy paintplus:8000,
  Authelia option preserved)
- container names -> paintplus across docker-compose*.yml; dev network
  -> paintplus-network
- browser <title> -> "PaintPlus - AI Image Editor"; README heading ->
  PaintPlus with upstream provenance note
- README utilities table: editmaskwithai -> paintplus

Backend/frontend code (help strings referencing the old container name,
the ai_photo_edit.db filename) is intentionally left as-is to avoid
touching application logic.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Nb2vJ8W7bHKx1JXVvpCraH

paintplus/frontend/src/js/modules/file/quicksave.js

@@ -0,0 +1,45 @@
+import config from './../../config.js';
+import File_save_class from './save.js';
+import Dialog_class from './../../libs/popup.js';
+import alertify from './../../../../node_modules/alertifyjs/build/alertify.min.js';
+
+/** 
+ * manages files / quick-save
+ * 
+ * @author ViliusL
+ */
+class File_quicksave_class {
+
+	constructor() {
+		this.POP = new Dialog_class();
+		this.File_save = new File_save_class();
+
+		this.set_events();
+	}
+
+	set_events() {
+		var _this = this;
+
+		document.addEventListener('keydown', function (event) {
+			var code = event.keyCode;
+
+			if (code == 120) {
+				//F9
+				_this.quicksave();
+			}
+		}, false);
+	}
+
+	quicksave() {
+		//save image data
+		var data_json = this.File_save.export_as_json();
+		if (data_json.length > 5000000) {
+			alertify.error('Sorry, image is too big, max 5 MB.');
+			return false;
+		}
+		localStorage.setItem('quicksave_data', data_json);
+	}
+
+}
+
+export default File_quicksave_class;