feat: integrate user profile pictures with circular avatar display and upload in settings

internal/domain/models.go

@@ -98,6 +98,7 @@ type User struct {
 	Username            string   `json:"username,omitempty"`
 	PasswordHash        string   `json:"-"`
 	DisplayName         string   `json:"displayName"`
+	AvatarURL           string   `json:"avatarUrl,omitempty"`
 	Role                string   `json:"role"` // admin | member
 	IsActive            bool     `json:"isActive"`
 	AlarmChannels       []string `json:"alarmChannels"` // email | discord | webhook
@@ -179,6 +180,7 @@ type TaskListShare struct {
 	TargetID   string `json:"targetId"`
 	TargetName string `json:"targetName,omitempty"`
 	Email      string `json:"email,omitempty"`
+	AvatarURL  string `json:"avatarUrl,omitempty"`
 	CreatedAt  string `json:"createdAt"`
 }
 
@@ -186,6 +188,7 @@ type TaskListMember struct {
 	UserID      string `json:"userId"`
 	DisplayName string `json:"displayName"`
 	Email       string `json:"email"`
+	AvatarURL   string `json:"avatarUrl,omitempty"`
 	Role        string `json:"role"` // owner | member
 }
 
@@ -238,6 +241,7 @@ type TeamMember struct {
 	UserID      string `json:"userId"`
 	DisplayName string `json:"displayName"`
 	Email       string `json:"email"`
+	AvatarURL   string `json:"avatarUrl,omitempty"`
 	Role        string `json:"role"` // admin | member
 	JoinedAt    string `json:"joinedAt"`
 }