feat: simplify architecture by removing cache layer and centralizing routes

- Removed over-engineered cache system for static CV data that only changes on deployment
- Extracted all route configuration to internal/routes/routes.go for better organization
- Implemented rate limiting and cache control middleware for PDF endpoint protection

internal/middleware/security.go

@@ -221,3 +221,17 @@ func (rl *RateLimiter) cleanup() {
 		rl.mu.Unlock()
 	}
 }
+
+// CacheControl adds cache headers to static files
+// 1 hour in development, 1 day in production
+func CacheControl(next http.Handler) http.Handler {
+	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		maxAge := "3600" // 1 hour
+		if os.Getenv("GO_ENV") == "production" {
+			maxAge = "86400" // 1 day
+		}
+
+		w.Header().Set("Cache-Control", "public, max-age="+maxAge)
+		next.ServeHTTP(w, r)
+	})
+}