feat: implement friendship system with requests and management features

- Added a new friendship table schema to manage friend requests and relationships.
- Updated profile page to include tabs for managing friends, incoming requests, and outgoing requests.
- Implemented functionality to send, accept, decline, cancel, and remove friend requests.
- Enhanced user experience with feedback messages for friend request actions.

src/lib/server/db/schema.ts

@@ -5,6 +5,7 @@ import { user } from './auth.schema';
 export type DevilFruitType = 'Paramecia' | 'Zoan' | 'Logia' | 'Smile' | 'Unknown';
 
 export type Status = 'Alive' | 'Dead' | 'Unknown';
+export type FriendshipStatus = 'pending' | 'accepted' | 'declined';
 
 // Define the site config table schema
 export const config = sqliteTable('config', {
@@ -122,5 +123,23 @@ export const userCharacterHistory = sqliteTable('userCharacterHistory', {
 	unique().on(table.userId, table.characterHistoryId)
 ]);
 
+// Define the friendship table schema (friend requests + accepted friends)
+export const friendship = sqliteTable('friendship', {
+	id: text('id')
+		.primaryKey()
+		.$defaultFn(() => crypto.randomUUID()),
+	requesterId: text('requesterId')
+		.notNull()
+		.references(() => user.id, { onDelete: 'cascade' }),
+	addresseeId: text('addresseeId')
+		.notNull()
+		.references(() => user.id, { onDelete: 'cascade' }),
+	status: text('status').$type<FriendshipStatus>().notNull().default('pending'),
+	createdAt: integer('createdAt').notNull().$default(() => Date.now()),
+	updatedAt: integer('updatedAt').notNull().$default(() => Date.now()),
+}, (table) => [
+	unique().on(table.requesterId, table.addresseeId)
+]);
+
 
 export * from './auth.schema';