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

frontend/src/lib/api.ts

@@ -163,6 +163,7 @@ export const api = {
     displayName?: string;
     email?: string;
     password?: string;
+    avatarUrl?: string;
     alarmChannels?: string[];
     alarmEmail?: string;
     discordWebhookUrl?: string;

frontend/src/lib/types.ts

@@ -14,6 +14,7 @@ export interface User {
   email: string;
   username?: string;
   displayName: string;
+  avatarUrl?: string;
   role: UserRole;
   isActive: boolean;
   alarmChannels?: string[];
@@ -79,6 +80,7 @@ export interface TaskListShare {
   targetId: string;
   targetName?: string;
   email?: string;
+  avatarUrl?: string;
   createdAt: string;
 }
 
@@ -86,6 +88,7 @@ export interface TaskListMember {
   userId: string;
   displayName: string;
   email: string;
+  avatarUrl?: string;
   role: string;
 }
 
@@ -132,6 +135,7 @@ export interface TeamMember {
   userId: string;
   displayName: string;
   email: string;
+  avatarUrl?: string;
   role: 'admin' | 'member';
   joinedAt: string;
 }
@@ -240,6 +244,7 @@ export interface SpaceMember {
   userId: string;
   displayName: string;
   email: string;
+  avatarUrl?: string;
   role: 'owner' | 'editor' | 'viewer';
   joinedAt: string;
 }
@@ -250,6 +255,7 @@ export interface UnifiedShare {
   targetId: string;
   targetName?: string;
   targetEmail?: string;
+  avatarUrl?: string;
   permission?: 'editor' | 'viewer';
   role?: string;
   createdBy?: string;