Implement structured logging with slog

- Replace zerolog with Go's standard slog package
- Add ColorHandler for terminal color output
- Add context-aware logging system
- Format attributes on the same line as log messages
- Use green color for INFO level logs
- Set up context value extraction helpers

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

hostPool/hostPool.go

@@ -1,49 +0,0 @@
-package hostPool
-
-import (
-	"sync"
-	"time"
-
-	"gemini-grc/logging"
-)
-
-var hostPool = HostPool{hostnames: make(map[string]struct{})} //nolint:gochecknoglobals
-
-type HostPool struct {
-	hostnames map[string]struct{}
-	lock      sync.RWMutex
-}
-
-//func (p *HostPool) add(key string) {
-//	p.lock.Lock()
-//	defer p.lock.Unlock()
-//	p.hostnames[key] = struct{}{}
-//}
-//
-//func (p *HostPool) has(key string) bool {
-//	p.lock.RLock()
-//	defer p.lock.RUnlock()
-//	_, ok := p.hostnames[key]
-//	return ok
-//}
-
-func RemoveHostFromPool(key string) {
-	hostPool.lock.Lock()
-	defer hostPool.lock.Unlock()
-	delete(hostPool.hostnames, key)
-}
-
-func AddHostToHostPool(key string) {
-	for {
-		hostPool.lock.Lock()
-		_, exists := hostPool.hostnames[key]
-		if !exists {
-			hostPool.hostnames[key] = struct{}{}
-			hostPool.lock.Unlock()
-			return
-		}
-		hostPool.lock.Unlock()
-		time.Sleep(1 * time.Second)
-		logging.LogInfo("Waiting to add %s to pool...", key)
-	}
-}