clean: Article to Post in domain and related use cases

Renamed the 'Article' domain to 'Post' in order to better reflect the purpose and utility of the object. The change involved renaming all related use cases, classes, and other references from 'Article' to 'Post' and updating all functions and data types to work with Posts instead of Articles.

api/post.go

@@ -0,0 +1,73 @@
+package api
+
+import (
+	"GohCMS2/useCases"
+	"encoding/json"
+	"github.com/go-chi/chi/v5"
+	"net/http"
+	"strconv"
+)
+
+type ArticlePost struct {
+	Title string `json:"title" validate:"required,min=3,max=50"`
+	Body  string `json:"body" validate:"required,max=10000"`
+}
+
+func getArticle(w http.ResponseWriter, r *http.Request) {
+	id, err := strconv.ParseUint(chi.URLParam(r, "id"), 10, 32)
+	if err != nil {
+		http.Error(w, "The server expects the ID to be in the format of an unsigned 32-bit integer (uint32).", http.StatusBadRequest)
+		return
+	}
+
+	article, err := Container.GetArticleUseCase.GetArticle(uint32(id))
+	if err != nil {
+		http.Error(w, "The requested resource, identified by its unique ID, could not be found on the server.", http.StatusNotFound)
+		return
+	}
+
+	articleJson, _ := json.Marshal(article)
+	_, _ = w.Write(articleJson)
+}
+
+func postArticle(w http.ResponseWriter, r *http.Request) {
+	var article ArticlePost
+	err := json.NewDecoder(r.Body).Decode(&article)
+	if err != nil {
+		http.Error(w, bodyErrorMessage, http.StatusBadRequest)
+		return
+	}
+
+	err = validate.Struct(article)
+	if err != nil {
+		http.Error(w, err.Error(), http.StatusBadRequest)
+		return
+	}
+
+	createdArticle, err := Container.CreateArticleUseCase.CreatePost(useCases.CreatePostCommand{
+		Title: article.Title,
+		Body:  article.Body,
+	})
+	if err != nil {
+		http.Error(w, err.Error(), http.StatusInternalServerError)
+		return
+	}
+	articleJson, _ := json.Marshal(createdArticle)
+
+	_, _ = w.Write(articleJson)
+}
+
+func listArticles(w http.ResponseWriter, _ *http.Request) {
+	articles := Container.ListArticlesUseCase.ListArticles()
+	articlesJson, _ := json.Marshal(articles)
+
+	_, _ = w.Write(articlesJson)
+}
+
+func NewArticleRouter() http.Handler {
+	r := chi.NewRouter()
+	r.Get("/{id}", getArticle)
+	r.Post("/", postArticle)
+	r.Get("/", listArticles)
+	return r
+}