refactor: replace Prisma ORM runtime with Drizzle ORM facade

- Replace Prisma client runtime with Drizzle ORM (zero Prisma engine/query engine in production)
- Add Prisma-compatible facade (@/lib/prisma-facade.ts) backed by Drizzle for backwards compatibility
- Runtime queries route through Drizzle ORM; @prisma/client is now devDependency (types only)
- Remove @prisma/adapter-mariadb dependency; delete prisma-pool.ts and types/prisma.ts
- New Drizzle schema layer: src/db/schema.ts (176 tables) and src/lib/db.ts (connection)
- Update README documenting the dual-layer ORM architecture
- Restore src/generated/ gitignore (build artifact for local type generation)
- 0 TypeScript errors, 583 tests passing

The facade intentionally uses `any` types to match the Prisma Client API surface,
allowing existing code to run unmodified while routing queries through Drizzle at runtime.

src/types/prisma.ts

@@ -1,19 +0,0 @@
-import type { Ban, User, UsersCurrency } from "@/generated/prisma/client";
-
-export type UserWithCurrencies = User & { currencies: UsersCurrency[] };
-export type UserWithPermission = User & { permission: { rankName: string } };
-export type UserPublicPreview = Pick<
-	User,
-	"id" | "username" | "look" | "motto"
->;
-export interface NotificationRow {
-	id: number;
-	userId: number;
-	type: string;
-	title: string;
-	message: string;
-	link: string | null;
-	readAt: string | null;
-	createdAt: string;
-}
-export type BanWithStaff = Ban & { staff: Pick<User, "id" | "username"> };