feat(shared): add pocketbase di client and domain errors

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_014hvR7iG75jK5byaBBHdDLT

vitest.lint.config.mts

@@ -0,0 +1,8 @@
+import { defineConfig } from 'vitest/config';
+
+// Тесты конфига ESLint: запускаются первым шагом в pnpm test, test:api и test:integration.
+export default defineConfig({
+    test: {
+        include: ['tests/lint/**/*.spec.ts'],
+    },
+});