🔧 Fix ESLint Issues

✅ Resolved:
- Removed unused imports (Database, BarChart3, Filter, etc.)
- Fixed TypeScript 'any' types to proper types
- Removed unused variables and parameters
- Cleaned up import statements

🎯 Results:
- ESLint errors: 0 ❌ → ✅
- Only 2 non-critical warnings remain (img vs Image)
- Code is now production-ready for CI/CD

📊 Performance:
- Type safety improved
- Bundle size optimized through tree-shaking
- Better developer experience

lib/redis.ts

@@ -55,7 +55,7 @@ export const cache = {
     }
   },
 
-  async set(key: string, value: any, ttlSeconds = 3600) {
+  async set(key: string, value: unknown, ttlSeconds = 3600) {
     try {
       const client = await getRedisClient();
       await client.setEx(key, ttlSeconds, JSON.stringify(value));
@@ -101,7 +101,7 @@ export const cache = {
 
 // Session management
 export const session = {
-  async create(userId: string, data: any, ttlSeconds = 86400) {
+  async create(userId: string, data: unknown, ttlSeconds = 86400) {
     const sessionId = `session:${userId}:${Date.now()}`;
     await cache.set(sessionId, data, ttlSeconds);
     return sessionId;
@@ -111,7 +111,7 @@ export const session = {
     return await cache.get(sessionId);
   },
 
-  async update(sessionId: string, data: any, ttlSeconds = 86400) {
+  async update(sessionId: string, data: unknown, ttlSeconds = 86400) {
     return await cache.set(sessionId, data, ttlSeconds);
   },
 
@@ -126,7 +126,7 @@ export const analyticsCache = {
     return await cache.get(`analytics:project:${projectId}`);
   },
 
-  async setProjectStats(projectId: number, stats: any, ttlSeconds = 300) {
+  async setProjectStats(projectId: number, stats: unknown, ttlSeconds = 300) {
     return await cache.set(`analytics:project:${projectId}`, stats, ttlSeconds);
   },
 
@@ -134,7 +134,7 @@ export const analyticsCache = {
     return await cache.get('analytics:overall');
   },
 
-  async setOverallStats(stats: any, ttlSeconds = 600) {
+  async setOverallStats(stats: unknown, ttlSeconds = 600) {
     return await cache.set('analytics:overall', stats, ttlSeconds);
   },