feat: เพิ่มระบบ caching

- เพิ่ม caching interceptor และ service

- เพิ่ม configสำหรับ caching

accounting-ng-nuttakit/src/app/services/caching.interceptor.ts

@@ -0,0 +1,52 @@
+import { Injectable } from '@angular/core';
+import {
+  HttpEvent, HttpInterceptor, HttpHandler, HttpRequest, HttpResponse
+} from '@angular/common/http';
+import { Observable, of } from 'rxjs';
+import { tap } from 'rxjs/operators';
+import { CachingService } from './caching.service';
+import { CACHEABLE_URLS } from '../config/caching.config';
+
+@Injectable()
+export class CachingInterceptor implements HttpInterceptor {
+
+  constructor(private cache: CachingService) {}
+
+  intercept(req: HttpRequest<any>, next: HttpHandler): Observable<HttpEvent<any>> {
+    if (!this.isCacheable(req)) {
+      return next.handle(req);
+    }
+
+    const cachedResponse = this.cache.get(this.getCacheKey(req));
+    if (cachedResponse) {
+      return of(cachedResponse.clone());
+    }
+
+    return next.handle(req).pipe(
+      tap(event => {
+        if (event instanceof HttpResponse) {
+          this.cache.put(this.getCacheKey(req), event.clone());
+        }
+      })
+    );
+  }
+
+  private isCacheable(req: HttpRequest<any>): boolean {
+    if (req.method === 'GET') {
+      return CACHEABLE_URLS.GET.some(url => req.urlWithParams.includes(url));
+    }
+
+    if (req.method === 'POST') {
+      return CACHEABLE_URLS.POST.some(url => req.urlWithParams.includes(url));
+    }
+
+    return false;
+  }
+
+  private getCacheKey(req: HttpRequest<any>): string {
+    if (req.method === 'POST') {
+      return req.urlWithParams + JSON.stringify(req.body);
+    }
+    return req.urlWithParams;
+  }
+}