fix: comprehensive security and type improvements from PR #20 review

Security Enhancements:
- Implemented proper rate limiting with automatic cleanup for /register and /forgot-password endpoints
- Added memory usage protection with MAX_ENTRIES limit (10000)
- Fixed rate limiter memory leaks by adding cleanup intervals
- Improved IP extraction with x-real-ip and x-client-ip header support

Code Quality Improvements:
- Refactored ProcessingStatusManager from individual functions to class-based architecture
- Maintained backward compatibility with singleton instance pattern
- Fixed TypeScript strict mode violations across the codebase
- Resolved all build errors and type mismatches

UI Component Fixes:
- Removed unused chart components (Charts.tsx, DonutChart.tsx)
- Fixed calendar component type issues by removing unused custom implementations
- Resolved theme provider type imports
- Fixed confetti component default options handling
- Corrected pointer component coordinate type definitions

Type System Improvements:
- Extended NextAuth types to support dual auth systems (regular and platform users)
- Fixed nullable type handling throughout the codebase
- Resolved Prisma JSON field type compatibility issues
- Corrected SessionMessage and ImportRecord interface definitions
- Fixed ES2015 iteration compatibility issues

Database & Performance:
- Updated database pool configuration for Prisma adapter compatibility
- Fixed pagination response structure in user management endpoints
- Improved error handling with proper error class usage

Testing & Build:
- All TypeScript compilation errors resolved
- ESLint warnings remain but no errors
- Build completes successfully with proper static generation

check-refactored-pipeline-status.ts

@@ -2,13 +2,14 @@ import { PrismaClient } from "@prisma/client";
 import { ProcessingStatusManager } from "./lib/processingStatusManager";
 
 const prisma = new PrismaClient();
+const statusManager = new ProcessingStatusManager(prisma);
 
 async function checkRefactoredPipelineStatus() {
   try {
     console.log("=== REFACTORED PIPELINE STATUS ===\n");
 
     // Get pipeline status using the new system
-    const pipelineStatus = await ProcessingStatusManager.getPipelineStatus();
+    const pipelineStatus = await statusManager.getPipelineStatus();
 
     console.log(`Total Sessions: ${pipelineStatus.totalSessions}\n`);
 
@@ -53,7 +54,7 @@ async function checkRefactoredPipelineStatus() {
     }
 
     // Show failed sessions if any
-    const failedSessions = await ProcessingStatusManager.getFailedSessions();
+    const failedSessions = await statusManager.getFailedSessions();
     if (failedSessions.length > 0) {
       console.log("\n=== FAILED SESSIONS ===");
       failedSessions.slice(0, 5).forEach((failure) => {
@@ -71,7 +72,7 @@ async function checkRefactoredPipelineStatus() {
 
     // Show sessions ready for AI processing
     const readyForAI =
-      await ProcessingStatusManager.getSessionsNeedingProcessing(
+      await statusManager.getSessionsNeedingProcessing(
         "AI_ANALYSIS",
         5
       );