fix: disable auto-enhancement in development mode to prevent live-reload loops

- Add dev_mode parameter to SiteManager constructor
- Modify IsAutoEnhanceEnabled() to return false when dev_mode is true
- Update serve.go to pass dev_mode flag to SiteManager
- Add ForceEnhanceEnabled() method for testing production behavior in development
- Update documentation to explain development vs production mode behavior

This fixes the development workflow where content updates would trigger
file modifications that caused unwanted page reloads in live-server.

Development mode: Content saved to database only, editor loads dynamically
Production mode: Content saved + files enhanced for immediate static deployment

internal/content/site_manager.go

@@ -24,10 +24,11 @@ type SiteManager struct {
 	enhancer  *Enhancer
 	mutex     sync.RWMutex
 	backupDir string
+	devMode   bool
 }
 
 // NewSiteManager creates a new site manager
-func NewSiteManager(contentClient ContentClient, backupDir string) *SiteManager {
+func NewSiteManager(contentClient ContentClient, backupDir string, devMode bool) *SiteManager {
 	if backupDir == "" {
 		backupDir = "./insertr-backups"
 	}
@@ -36,6 +37,7 @@ func NewSiteManager(contentClient ContentClient, backupDir string) *SiteManager
 		sites:     make(map[string]*SiteConfig),
 		enhancer:  NewEnhancer(contentClient, ""), // siteID will be set per operation
 		backupDir: backupDir,
+		devMode:   devMode,
 	}
 }
 
@@ -103,10 +105,26 @@ func (sm *SiteManager) GetAllSites() map[string]*SiteConfig {
 }
 
 // IsAutoEnhanceEnabled checks if a site has auto-enhancement enabled
+// Returns false in development mode to prevent unwanted file modifications and live-reload loops
 func (sm *SiteManager) IsAutoEnhanceEnabled(siteID string) bool {
 	sm.mutex.RLock()
 	defer sm.mutex.RUnlock()
 
+	// Disable auto-enhancement in development mode to prevent file modification conflicts with live-reload
+	if sm.devMode {
+		return false
+	}
+
+	site, exists := sm.sites[siteID]
+	return exists && site.AutoEnhance
+}
+
+// ForceEnhanceEnabled allows testing production behavior in development mode
+// This method bypasses the dev_mode check for testing purposes
+func (sm *SiteManager) ForceEnhanceEnabled(siteID string) bool {
+	sm.mutex.RLock()
+	defer sm.mutex.RUnlock()
+
 	site, exists := sm.sites[siteID]
 	return exists && site.AutoEnhance
 }