feat: add CoopCredits Solana media rewards ecosystem

Add complete  token system with Plex/Tautulli/Overseer integration:
- Anchor program for SPL token mint/burn/transfer
- Express backend with OAuth, webhooks, Solana integration
- Next.js frontend with dashboard, admin panel, wallet management
- Docker deployment for 172.20.1.0/24 infrastructure
- Production configs with SSL, Nginx, health monitoring

Tautulli webhooks auto-mint  on watch events.
Overseer integration burns  for content requests.

backend/src/middleware/errorHandler.ts

@@ -0,0 +1,32 @@
+import { Request, Response, NextFunction } from 'express';
+
+export interface ApiError extends Error {
+  statusCode?: number;
+  code?: string;
+}
+
+export const errorHandler = (
+  err: ApiError,
+  _req: Request,
+  res: Response,
+  _next: NextFunction
+) => {
+  console.error('Error:', err);
+
+  const statusCode = err.statusCode || 500;
+  const message = err.message || 'Internal Server Error';
+
+  res.status(statusCode).json({
+    error: {
+      message,
+      code: err.code || 'INTERNAL_ERROR',
+      ...(process.env.NODE_ENV === 'development' && { stack: err.stack })
+    }
+  });
+};
+
+export const asyncHandler = (fn: Function) => {
+  return (req: Request, res: Response, next: NextFunction) => {
+    Promise.resolve(fn(req, res, next)).catch(next);
+  };
+};