test: add comprehensive testing infrastructure with critical bug fixes

- Add Vitest testing framework with 88 passing tests across 4 test files
- Fix critical entity validator bug (service array index)
- Implement validator architecture with 'matched but invalid' state support
- Add strict IPv4/IPv6 validation with detailed error messages
- Add case-insensitive domain and ASN matching
- Add explicit validator priority ordering (url→json→tld→ip→domain)
- Add integration tests with real IANA registry validation
- Add AutnumCard component for AS number display
- Update dependencies: prettier 2.8.1→2.8.8

Test coverage:
- helpers.test.ts: IPv4/IPv6 CIDR matching (27 tests)
- helpers.asn.test.ts: ASN range validation (22 tests)
- rdap.test.ts: Type detection with edge cases (36 tests)
- rdap.integration.test.ts: Real IANA registry tests (3 tests)

Bug fixes:
- Entity validator now correctly uses service[1] for tags (0=email, 1=tags, 2=urls)
- IPv4 validation rejects octets >255 with specific error messages
- IPv6 validation checks for invalid hex chars and multiple ::
- Domain regex supports multi-label domains (a.b.c.d.example.net)
- Type detection priority prevents URL/JSON false matches as domains

vitest.config.ts

@@ -1,15 +1,15 @@
-import { defineConfig } from 'vitest/config';
-import path from 'path';
+import { defineConfig } from "vitest/config";
+import path from "path";
 
 export default defineConfig({
   test: {
     globals: true,
-    environment: 'happy-dom',
-    setupFiles: ['./src/test/setup.ts'],
+    environment: "happy-dom",
+    setupFiles: ["./src/test/setup.ts"],
   },
   resolve: {
     alias: {
-      '@': path.resolve(__dirname, './src'),
+      "@": path.resolve(__dirname, "./src"),
     },
   },
 });