setup application, server, and configs

src/configs/_env.ts

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+import z from "zod";
+
+export const _env = z
+	.object({
+		SERVER_HOST: z.string("Must be string."),
+		SERVER_PORT: z.coerce
+			.number("Must be number.")
+			.int("Must be integer.")
+			.min(0, "Min 0."),
+
+		DATABASE_HOST: z.string("Must be string.").nonempty("Must not empty."),
+		DATABASE_PORT: z.coerce
+			.number("Must be number.")
+			.int("Must be integer.")
+			.min(0, "Min 0."),
+		DATABASE_USERNAME: z.string("Must be string.").nonempty("Must not empty."),
+		DATABASE_PASSWORD: z.string("Must be string.").nonempty("Must not empty."),
+		DATABASE_NAME: z.string("Must be string.").nonempty("Must not empty."),
+	})
+	.parse(Bun.env);

src/configs/database.config.ts

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+import { _env } from "@/configs/_env";
+
+export const databaseConfig = {
+	host: _env.DATABASE_HOST,
+	port: _env.DATABASE_PORT,
+	username: _env.DATABASE_USERNAME,
+	password: _env.DATABASE_PASSWORD,
+	name: _env.DATABASE_NAME,
+} as const;

src/configs/server.config.ts

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+import { _env } from "@/configs/_env";
+
+export const serverConfig = {
+	host: _env.SERVER_HOST,
+	port: _env.SERVER_PORT,
+} as const;