feat: add logo image and RTL support styles

- Added logo image to assets.
- Implemented RTL support styles in rtlSupport.scss for various components including breadcrumb, datatable, and tree node toggle button.

chore: configure environment files for production, staging, and development

- Created environment.prod.ts for production settings.
- Created environment.staging.ts for staging settings.
- Created environment.ts for local development settings.

feat: define custom theme preset

- Added presets.ts to define a custom theme preset using PrimeUIX with specific component styles and semantic colors.

chore: set up proxy configuration for local development

src/app/uikit/uikit-emptystate.component.ts

@@ -0,0 +1,36 @@
+import {
+    AfterContentInit,
+    Component,
+    ContentChild,
+    ElementRef,
+    EventEmitter,
+    Input,
+    Output,
+} from '@angular/core';
+
+import { CommonModule } from '@angular/common';
+import { Button } from 'primeng/button';
+
+@Component({
+    selector: 'uikit-empty-state',
+    standalone: true,
+    imports: [CommonModule, Button],
+    templateUrl: './uikit-emptystate.component.html',
+})
+export class UikitEmptyStateComponent implements AfterContentInit {
+    @ContentChild('cta', { static: false, read: ElementRef })
+    ctaContent?: ElementRef;
+    hasCtaContent = false;
+
+    @Input() title: string = 'متاسفانه موردی یافت نشد.';
+    @Input() description?: string;
+    @Input() icon: string = 'pi pi-database';
+    @Input() ctaLabel?: string;
+    @Input() showCTA?: boolean = true;
+
+    @Output() ctaClick = new EventEmitter<void>();
+
+    ngAfterContentInit() {
+        this.hasCtaContent = !!this.ctaContent;
+    }
+}