feat: add voice recordings feature with database integration

- Implemented PostgreSQL and SQLite schemas for voice recordings.
- Created repository functions for inserting, updating, and listing voice recordings.
- Developed uploader logic to handle file uploads and database updates.
- Added routes for accessing voice recordings via API.
- Enhanced UI state to include recordings tab.
- Introduced moderation WebSocket event for uploaded recordings.

frontend/src/types/ui.ts

@@ -1,4 +1,4 @@
-export type DashboardTab = "voice" | "media" | "messages" | "review";
+export type DashboardTab = "voice" | "media" | "messages" | "review" | "recordings";
 
 export interface UIState {
   selectedGuild?: string;