🔧 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/cache.ts

@@ -6,7 +6,7 @@ export const apiCache = {
     return await cache.get('api:projects');
   },
 
-  async setProjects(projects: any, ttlSeconds = 300) {
+  async setProjects(projects: unknown, ttlSeconds = 300) {
     return await cache.set('api:projects', projects, ttlSeconds);
   },
 
@@ -14,7 +14,7 @@ export const apiCache = {
     return await cache.get(`api:project:${id}`);
   },
 
-  async setProject(id: number, project: any, ttlSeconds = 300) {
+  async setProject(id: number, project: unknown, ttlSeconds = 300) {
     return await cache.set(`api:project:${id}`, project, ttlSeconds);
   },
 
@@ -45,7 +45,7 @@ export const performanceCache = {
     return await cache.get(`perf:${url}`);
   },
 
-  async setMetrics(url: string, metrics: any, ttlSeconds = 600) {
+  async setMetrics(url: string, metrics: unknown, ttlSeconds = 600) {
     return await cache.set(`perf:${url}`, metrics, ttlSeconds);
   },
 
@@ -53,7 +53,7 @@ export const performanceCache = {
     return await cache.get('perf:webvitals');
   },
 
-  async setWebVitals(vitals: any, ttlSeconds = 300) {
+  async setWebVitals(vitals: unknown, ttlSeconds = 300) {
     return await cache.set('perf:webvitals', vitals, ttlSeconds);
   }
 };
@@ -64,7 +64,7 @@ export const userCache = {
     return await cache.get(`user:session:${sessionId}`);
   },
 
-  async setSession(sessionId: string, data: any, ttlSeconds = 86400) {
+  async setSession(sessionId: string, data: unknown, ttlSeconds = 86400) {
     return await cache.set(`user:session:${sessionId}`, data, ttlSeconds);
   },
 
@@ -76,7 +76,7 @@ export const userCache = {
     return await cache.get(`user:prefs:${userId}`);
   },
 
-  async setUserPreferences(userId: string, prefs: any, ttlSeconds = 86400) {
+  async setUserPreferences(userId: string, prefs: unknown, ttlSeconds = 86400) {
     return await cache.set(`user:prefs:${userId}`, prefs, ttlSeconds);
   }
 };