refactor(observability): remove console.log from tags proxy and enforce no-console lint rule

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

frontend/eslint.config.js

@@ -38,7 +38,10 @@ export default defineConfig(
 			'no-undef': 'off',
 			// This rule is designed for Svelte 5's own routing system using resolve().
 			// In SvelteKit, <a href> and goto() from $app/navigation are the correct patterns — resolve() is not needed.
-			'svelte/no-navigation-without-resolve': 'off'
+			'svelte/no-navigation-without-resolve': 'off',
+			// Prevents accidental console.log left in source. console.warn and console.error
+			// are still permitted for intentional server-side logging (e.g. hooks.server.ts).
+			'no-console': ['error', { allow: ['warn', 'error'] }]
 		}
 	},
 	{
@@ -71,6 +74,13 @@ export default defineConfig(
 			]
 		}
 	},
+	{
+		// E2E tests use console.log for diagnostic output — allow it there.
+		files: ['e2e/**'],
+		rules: {
+			'no-console': 'off'
+		}
+	},
 	{
 		files: ['**/*.spec.ts', '**/*.test.ts'],
 		rules: {

frontend/src/routes/api/tags/+server.ts

@@ -24,7 +24,6 @@ export const GET: RequestHandler = async ({ url, fetch }) => {
 		}
 
 		const data = await response.json();
-		console.log('Tags Data', data);
 
 		// 4. Daten zurück an den Browser schicken
 		return json(data);