feat(phase3): phase 7 - integration & polish

Fix all build/type/lint errors, write 46 new tests (222 total across
20 files), regenerate Prisma client, update seed with user preferences.
Fix SvelteSet usage, add {#each} keys, clean unused imports.

prisma/seed.ts

@@ -36,7 +36,12 @@ async function main() {
 			password: adminPassword,
 			displayName: 'Administrator',
 			role: 'admin',
-			authProvider: 'local'
+			authProvider: 'local',
+			themeMode: 'dark',
+			primaryHue: 240,
+			primarySaturation: 80,
+			backgroundType: 'aurora',
+			locale: 'en'
 		}
 	});
 	console.log('  Created admin user:', admin.email);
@@ -51,7 +56,12 @@ async function main() {
 			password: userPassword,
 			displayName: 'Demo User',
 			role: 'user',
-			authProvider: 'local'
+			authProvider: 'local',
+			themeMode: 'light',
+			primaryHue: 150,
+			primarySaturation: 60,
+			backgroundType: 'mesh',
+			locale: 'ru'
 		}
 	});
 	console.log('  Created regular user:', regularUser.email);
@@ -168,6 +178,16 @@ async function main() {
 			category: 'Network',
 			tags: 'dns,adblock,network,privacy',
 			healthcheckEnabled: true
+		},
+		{
+			name: 'Wiki.js',
+			url: 'http://wiki.local:3000',
+			icon: 'http://wiki.local:3000/favicon.ico',
+			iconType: 'url',
+			description: 'Quick-added wiki service (demonstrates favicon URL icon)',
+			category: 'Productivity',
+			tags: 'wiki,docs,knowledge',
+			healthcheckEnabled: true
 		}
 	];