feat: add comments functionality and integrate Socket.io for real-time updates

- Implemented a full comments module in the backend with repository, service, controller, and DTOs using NestJS.
- Added frontend support for comments with a `CommentSection` component and integration into content pages.
- Introduced `SocketProvider` on the frontend and integrated Socket.io for real-time communication.
- Updated dependencies and configurations for Socket.io and WebSockets support.

backend/src/database/schemas/comments.ts

@@ -0,0 +1,31 @@
+import { index, pgTable, text, timestamp, uuid } from "drizzle-orm/pg-core";
+import { contents } from "./content";
+import { users } from "./users";
+
+export const comments = pgTable(
+	"comments",
+	{
+		id: uuid("id").primaryKey().defaultRandom(),
+		contentId: uuid("content_id")
+			.notNull()
+			.references(() => contents.id, { onDelete: "cascade" }),
+		userId: uuid("user_id")
+			.notNull()
+			.references(() => users.uuid, { onDelete: "cascade" }),
+		text: text("text").notNull(),
+		createdAt: timestamp("created_at", { withTimezone: true })
+			.notNull()
+			.defaultNow(),
+		updatedAt: timestamp("updated_at", { withTimezone: true })
+			.notNull()
+			.defaultNow(),
+		deletedAt: timestamp("deleted_at", { withTimezone: true }),
+	},
+	(table) => ({
+		contentIdIdx: index("comments_content_id_idx").on(table.contentId),
+		userIdIdx: index("comments_user_id_idx").on(table.userId),
+	}),
+);
+
+export type CommentInDb = typeof comments.$inferSelect;
+export type NewCommentInDb = typeof comments.$inferInsert;

backend/src/database/schemas/index.ts

@@ -1,11 +1,13 @@
 export * from "./api_keys";
 export * from "./audit_logs";
 export * from "./categories";
+export * from "./comments";
 export * from "./content";
 export * from "./favorites";
 export * from "./pgp";
 export * from "./rbac";
 export * from "./reports";
+export * from "./messages";
 export * from "./sessions";
 export * from "./tags";
 export * from "./users";