Refactor runner and API components to remove IP address handling. Update client and server logic to streamline runner registration and task distribution. Introduce write mutexes for connection management to enhance concurrency control. Clean up whitespace and improve code readability across multiple files.

pkg/types/types.go

@@ -153,7 +153,7 @@ type UpdateJobProgressRequest struct {
 type RegisterRunnerRequest struct {
 	Name         string `json:"name"`
 	Hostname     string `json:"hostname"`
-	IPAddress    string `json:"ip_address"`
+	IPAddress    string `json:"ip_address,omitempty"` // Optional, extracted from request by manager
 	Capabilities string `json:"capabilities"`
 	Priority     *int   `json:"priority,omitempty"` // Optional, defaults to 100 if not provided
 }