Add guild routes, setup tables, validators, and update environment example

Added routes for guild creation, deletion, joining, leaving, and invites
Set up Cassandra tables for guilds, invites, and members
Added validators for guild input
Updated .env.example with required config values

types/validation.d.ts

@@ -7,4 +7,5 @@ type validationResult = {
 	valid: boolean;
 	error?: string;
 	username?: string;
+	name?: string;
 };