FEAT: Plugin Manager folder picker + scan dirs (Windows/macOS), docker .env paths, status bar adaptive tips, DSP Tool vao sub-tab audioclip

- Plugins Manager (Tools menu): Browse folder (Tauri dialog + fallback paste path), Save & Scan VST/SoundFont dirs -> plugin_dirs.json (user override, env la base)
- Docker: VST_DIR/SOUNDFONT_DIR/PIANOBK_DIR tu .env/docker-compose mount vao container + env cho engine/celery
- Status bar: bo label 'Scroll: Zoom' -> Adaptive tips (prHint + fallback text)
- DSP Tool: move vao SUB-TAB editor audioclip (Phase Inv / Swap L/R / Reverse + apply vung chon/ca clip)
- Tauri: them tauri-plugin-dialog + dialog:default permission cho folder picker

app/config.py

@@ -29,4 +29,9 @@ class Settings:
     UPLOADS_DIR: str = os.path.join(STORAGE_DIR, "uploads")
     PROCESSED_DIR: str = os.path.join(STORAGE_DIR, "processed")
 
+    # Plugin dirs — người dùng khai báo qua .env / docker-compose (Docker)
+    # hoặc qua Plugins Manager (Windows/macOS, lưu theo user).
+    VST_DIR: str = os.getenv("VST_DIR", "/opt/daw_engine/vst3")
+    SOUNDFONT_DIR: str = os.getenv("SOUNDFONT_DIR", "/opt/daw_engine/soundfonts")
+
 settings = Settings()