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

tailwind.config.cjs

@@ -1,21 +1,21 @@
 /** @type {import('tailwindcss').Config} */
-const defaultTheme = require('tailwindcss/defaultTheme')
+const defaultTheme = require("tailwindcss/defaultTheme");
 
 module.exports = {
-    content: ["./src/**/*.{js,ts,jsx,tsx}"],
-    darkMode: "class",
-    theme: {
-        extend: {
-            fontFamily: {
-                mono: ['IBM Plex Mono', ...defaultTheme.fontFamily.mono],
-                sans: ['Inter var', ...defaultTheme.fontFamily.sans],
-            },
-            colors: {
-                zinc: {
-                    850: "#1D1D20",
-                },
-            },
+  content: ["./src/**/*.{js,ts,jsx,tsx}"],
+  darkMode: "class",
+  theme: {
+    extend: {
+      fontFamily: {
+        mono: ["IBM Plex Mono", ...defaultTheme.fontFamily.mono],
+        sans: ["Inter var", ...defaultTheme.fontFamily.sans],
+      },
+      colors: {
+        zinc: {
+          850: "#1D1D20",
         },
+      },
     },
-    plugins: [],
+  },
+  plugins: [],
 };